This list of the Cenozoic life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado and are between 66 million and 10,000 years of age.

A

• 

  Abies
  • † Abies longirostris
• † Absarokius
  • † Absarokius abbotti – or unidentified comparable form
  • † Absarokius metoecus
• † Absyrtus
  • † Absyrtus decrepitus – type locality for species
• † Acaenitus
  • † Acaenitus defunctus – type locality for species
• † Acalles
  • † Acalles exhumatus – type locality for species
• † Acallomyia
  • † Acallomyia probolaea – type locality for species
• † Acalyptus
  • † Acalyptus obtusus – type locality for species
• † Acanthomyites – type locality for genus
  • † Acanthomyites aldrichi – type locality for species
• † Acarictis – or unidentified comparable form
  • † Acarictis ryani
• Acer
  • † Acer florissanti
  • † Acer fragile
  • † Acer macginitiei
  • † Acer oregonianum
• † Achrestocoris – type locality for genus
  • † Achrestocoris cinerarius – type locality for species
• † Acilius
  • † Acilius florissantensis – type locality for species
• † Aciprion – type locality for genus
  • † Aciprion formosum – type locality for species
  • † Aciprion majus – type locality for species
• † Acnemia
  • † Acnemia cyclosoma – type locality for species
• † Acocephalus
  • † Acocephalus callosus – type locality for species
• Acris
• † Acritoparamys
  • † Acritoparamys atwateri
  • † Acritoparamys pattersoni
• Acrostichum
  • † Acrostichum hesperium
• † Acylophorus
  • † Acylophorus immotus – type locality for species
• † Adalia
  • † Adalia subversa – type locality for species
• † Adelocera
  • † Adelocera perantiqua – type locality for species
• † Adelopsyche – type locality for genus
  • † Adelopsyche frustrans – type locality for species
• † Adjidaumo
  • † Adjidaumo minimus
  • † Adjidaumo minutus

• 

  † Adocus
• Aegialia
  • † Aegialia opaca
• † Aelurodon
  • † Aelurodon asthenostylus

• 

  † Aepycamelus
  • † Aepycamelus giraffinus
• Aeshna
  • † Aeshna larvata – type locality for species
  • † Aeshna solida – type locality for species
• Agabus
  • † Agabus charon – type locality for species
  • † Agabus florissantensis – type locality for species
  • † Agabus infuscatus
  • † Agabus rathbuni – type locality for species
• † Agallia
  • † Agallia abstructa – type locality for species
  • † Agallia flaccida – type locality for species
  • † Agallia instabilis – type locality for species
  • † Agallia lewisii – type locality for species
• † Agathemera
  • † Agathemera reclusa – type locality for species

• 

  Agelaius
  • † Agelaius phoenicieus
• † Agenia
  • † Agenia cockerellae – type locality for species
  • † Agenia saxigena – type locality for species
• † Agnotocastor
  • † Agnotocastor coloradensis – type locality for species
• Agoliinus
  • † Agoliinus plutonicus
• Agrilus
  • † Agrilus liragus
  • † Agrilus praepolitus – type locality for species
• † Agrion
  • † Agrion exsularis – type locality for species
  • † Agrion mascescens – type locality for species
  • † Agrion telluris – type locality for species

• 

  Agriotes
  • † Agriotes apicalis
  • † Agriotes comminutus – type locality for species
  • † Agriotes nearcticus – type locality for species
• † Agromyza
  • † Agromyza praecursor – type locality for species
• † Agulla
  • † Agulla protomaculata – type locality for species
• † Agyrtes
  • † Agyrtes primoticus – type locality for species
• † Ailanthus
  • † Ailanthus americana
  • † Ailanthus lesquereuxi
• † Aleocharopsis
  • † Aleocharopsis caseyi – type locality for species
  • † Aleocharopsis secunda – type locality for species
• † Alepidophora – type locality for genus
  • † Alepidophora cockerelli – type locality for species
  • † Alepidophora minor – type locality for species
  • † Alepidophora pealei – type locality for species
• † Aletodon
  • † Aletodon gunnelli – or unidentified comparable form
• Aleurites
  • † Aleurites glandulosa
• † Alforjas – tentative report
• † Alismaphyllites
  • † Alismaphyllites grandifolius
• † Allantodiopsis
  • † Allantodiopsis erosa

• 

  † Allognathosuchus
  • † Allognathosuchus polyodon
• † Allophaiomys
  • † Allophaiomys pliocaenicus
• † Allophylus
  • † Allophylus flexifolia
• † Alomatia – type locality for genus
  • † Alomatia fusca – type locality for species
• Altica
  • † Altica renovata – type locality for species
• † Alticonus – type locality for genus
  • † Alticonus gazini – type locality for species
• † Alysia
  • † Alysia exigua – type locality for species
  • † Alysia petrina – type locality for species
  • † Alysia phanerognatha – type locality for species
  • † Alysia ruskii – type locality for species
• Amara
  • † Amara cockerelli – type locality for species
  • † Amara danae – type locality for species
  • † Amara powellii – type locality for species
  • † Amara revocata – type locality for species
  • † Amara sterilis
  • † Amara veterata – type locality for species
• † Amartus
  • † Amartus petrefactus – type locality for species
• † Amauropilio
  • † Amauropilio atavus – type locality for species
  • † Amauropilio lacoei – type locality for species
• † Amblycorypha – tentative report
  • † Amblycorypha perdita – type locality for species
• † Amblyteles
  • † Amblyteles pealei – type locality for species
• † Ambystoma
  • † Ambystoma alamosensis – type locality for species
  • † Ambystoma tigrinum

• 

  † Amebelodon
  • † Amebelodon floridanus
• Amelanchier
  • † Amelanchier peritula
  • † Amelanchier scudderi
• Amia
• †Ammophila
  • † Ammophila antiquella – type locality for species
• † Ampelopsis
  • † Ampelopsis acerifolia
• † Amphechinus
  • † Amphechinus horncloudi
• † Amphicerus
  • † Amphicerus sublaevis
• Amphicosmus
  • † Amphicosmus delicatulus – type locality for species
• † Amphicyon
  • † Amphicyon galushai
  • † Amphicyon ingens
• † Amphicyrta
  • † Amphicyrta inhaesa – type locality for species

• 

  † Amphimachairodus
  • † Amphimachairodus coloradensis
• † Ampliconus – type locality for genus
  • † Ampliconus browni – type locality for species
• † Anabrus
  • † Anabrus caudelli – type locality for species
• Anas
• † Anasa
  • † Anasa priscoputida – type locality for species
• † Anatis
  • † Anatis resurgens – type locality for species
• † Anchastus
  • † Anchastus diluvialis – type locality for species
  • † Anchastus eruptus – type locality for species
• † Anchitherium
• † Anconatus – type locality for genus
  • † Anconatus dorsuosus – type locality for species
  • † Anconatus niger – type locality for species
• Andrena
  • † Andrena clavula – type locality for species
  • † Andrena grandipes – type locality for species
  • † Andrena hypolitha – type locality for species
  • † Andrena lagopus
  • † Andrena percontusa – type locality for species
  • † Andrena sepulta – type locality for species
• † Andrenopteryx
  • † Andrenopteryx willardi
• † Andrias
  • † Andrias matthewi
• † Andricus
  • † Andricus myricae – type locality for species
• † Anelaphus
  • † Anelaphus extinctus – type locality for species
• † Anemia
  • † Anemia elongata

• 

  † Angustidens
  • † Angustidens vireti
• † Anisonchus
  • † Anisonchus athelas – or unidentified comparable form
• Anisotoma
  • † Anisotoma sibylla – type locality for species
• † Ankylodon
  • † Ankylodon annectens
• † Anobium
  • † Anobium durescens – type locality for species
• † Anomala
  • † Anomala exterranea – type locality for species
  • † Anomala scudderi – type locality for species
• † Anomalon
  • † Anomalon deletum – type locality for species
  • † Anomalon excisum – type locality for species
  • † Anomalon miocenicum – type locality for species
• Anser
• † Antas
  • † Antas crecca

• 

  Anthaxia
  • † Anthaxia exhumata – type locality for species
  • † Anthaxia prasina
• † Antherophagus
  • † Antherophagus megalops – type locality for species
• † Anthidium
  • † Anthidium exhumatum – type locality for species
  • † Anthidium scudderi – type locality for species
• † Antholithes
  • † Antholithes amoenus
  • † Antholithes pediloides

• 

  † Anthomyia
  • † Anthomyia atavella – type locality for species
  • † Anthomyia laminarum – type locality for species
  • † Anthomyia persepulta – type locality for species
  • † Anthomyia winchesteri – type locality for species
• Anthonomus
  • † Anthonomus concussus – type locality for species
  • † Anthonomus debilatus – type locality for species
  • † Anthonomus defossus – type locality for species
  • † Anthonomus evigilatus – type locality for species
  • † Anthonomus primordius – type locality for species
  • † Anthonomus rohweri – type locality for species
  • † Anthonomus soporus
• † Anthophora
  • † Anthophora melfordi – type locality for species
• † Antiacodon
  • † Antiacodon pygmaeus

• 

  Antilocapra
  • † Antilocapra americana
• † Antocha
  • † Antocha principialis – type locality for species
• † Apanthesis – type locality for genus
  • † Apanthesis leuce – type locality for species
• † Apatosciuravus
  • † Apatosciuravus bifax
• † Aphaena
  • † Aphaena atava – type locality for species
• Aphaenogaster
  • † Aphaenogaster donisthorpei – type locality for species
  • † Aphaenogaster mayri – type locality for species
• † Apheliscus
• † Aphelops
  • † Aphelops malacorhinus
  • † Aphelops megalodus
  • † Aphelops mutilus
• † Aphidopsis
  • † Aphidopsis margarum – type locality for species
• Aphodius
  • † Aphodius aboriginalis – type locality for species
  • † Aphodius florissantensis – type locality for species
  • † Aphodius granarioides – type locality for species
  • † Aphodius inundatus – type locality for species
  • † Aphodius laminicola – type locality for species
  • † Aphodius mediaevus – type locality for species
  • † Aphodius praeemptor – type locality for species
  • † Aphodius senex – type locality for species
  • † Aphodius shoshonis – type locality for species

• 

  Aphrophora
• Apion
  • † Apion attenuatum
  • † Apion cockerelli – type locality for species
  • † Apion evestigatum – type locality for species
• † Apocymospermum
• † Apocynophyllum
  • † Apocynophyllum lesquereuxi
• † Apolysis
  • † Apolysis magister – type locality for species
• † Aporema – type locality for genus
  • † Aporema praestrictum – type locality for species
• † Apsilocephala
  • † Apsilocephala vagabunda – type locality for species
• † Apternodus
  • † Apternodus iliffensis
• Aquila

  • 

    † Aquila chysaetos
• † Araneaovoius
  • † Araneaovoius columbiae
• Araneus
  • † Araneus absconditus – type locality for species
  • † Araneus cinefactus – type locality for species
  • † Araneus delitus – type locality for species
  • † Araneus emertoni – type locality for species
  • † Araneus kinchloeae – type locality for species
  • † Araneus longimanus – type locality for species
  • † Araneus meeki – type locality for species
  • † Araneus vulcanalis – type locality for species
• † Archaeochrysa
  • † Archaeochrysa creedei – type locality for species
  • † Archaeochrysa fracta – type locality for species
  • † Archaeochrysa paranervis – type locality for species
• † Archaeomnium
  • † Archaeomnium brownii

• 

  † Archaeotherium
  • † Archaeotherium mortoni
• † Archalia – type locality for genus
  • † Archalia femorata – type locality for species
• † Archimyrmex – type locality for genus
  • † Archimyrmex rostratus – type locality for species
• † Archiponera – type locality for genus
  • † Archiponera wheeleri – type locality for species
• † Archiraphidia
  • † Archiraphidia somnolenta – type locality for species
  • † Archiraphidia tranquilla – type locality for species
  • † Archiraphidia tumulata – type locality for species
• Arctobyrrhus
  • † Arctobyrrhus subcanus

• 

  † Arctocyon
  • † Arctocyon mumak
• † Arctodontomys
  • † Arctodontomys nuptus
  • † Arctodontomys wilsoni
• † Arctostylops – tentative report
• † Arfia
  • † Arfia opisthotoma
  • † Arfia shoshoniensis
• † Argia
  • † Argia aliena – type locality for species
• † Arhopalus
  • † Arhopalus pavitus – type locality for species

• 

  † Aristolochia
  • † Aristolochia mortua
• † Artimonius
  • † Artimonius australis
  • † Artimonius nocerai
• † Artocarpus
  • † Artocarpus lessigiana
• † Asilus
  • † Asilus amelanchieris – type locality for species
  • † Asilus curculionis – type locality for species
  • † Asilus florissantinus – type locality for species
  • † Asilus peritulus – type locality for species
  • † Asilus wickhami – type locality for species

• 

  † Asimina
  • † Asimina vesperalis
• Asio
• † Aspicolpus
  • † Aspicolpus repertus – type locality for species
• † Asplenium
  • † Asplenium delicatula – or unidentified comparable form
• † Astephus
• † Aster
  • † Aster florissantia
• † Asterocarpinus
  • † Asterocarpinus perplexans

• 

  † Astronium
  • † Astronium calyx
  • † Astronium truncatum
• Asynarchus
• Ataenius
  • † Ataenius patescens – type locality for species
  • † Ataenius restructus – type locality for species
• † Atalantycha
  • † Atalantycha humata – type locality for species
• † Athalia
  • † Athalia wheeleri – type locality for species
• Atheta
  • † Atheta florissantensis – type locality for species

• 

  † Athous
  • † Athous contusus – type locality for species
  • † Athous fractus – type locality for species
  • † Athous lethalis – type locality for species
• † Athyana
  • † Athyana haydenii
• † Atocus – type locality for genus
  • † Atocus cockerelli – type locality for species
  • † Atocus defessus – type locality for species
• † Atrichops
  • † Atrichops hesperius – type locality for species
• † Attagenus
  • † Attagenus aboriginalis – type locality for species
  • † Attagenus sopitus – type locality for species
• † Aulacidea
  • † Aulacidea ampliforma – type locality for species
  • † Aulacidea progenetrix – type locality for species
• † Aulacus
  • † Aulacus bradleyi – type locality for species
• † Aulobaris
  • † Aulobaris anicilla – type locality for species
  • † Aulobaris circumscripta
  • † Aulobaris damnata – type locality for species
• † Auraria – type locality for genus
  • † Auraria urbana – type locality for species
• † Averrhoites
  • † Averrhoites affinis
• † Axestemys – type locality for genus
  • † Axestemys puercensis – or unidentified comparable form
  • † Axestemys quinni – type locality for species
• Aythya
  • † Aythya affinis
  • † Aythya americana

• 

  † Aztlanolagus

B

• † Baena
  • † Baena arenosa
• † Baioconodon
  • † Baioconodon denverensis – type locality for species
  • † Baioconodon nordicus
• † Baltemys
  • † Baltemys velogastros – type locality for species
• † Baptemys
  • † Baptemys wyomingensis
• † Barbouromeryx
• † Baris
  • † Baris antediluviana – type locality for species
  • † Baris cremastorhynchoides – type locality for species
  • † Baris divisa – type locality for species
  • † Baris florissantensis – type locality for species
  • † Baris harlani – type locality for species
  • † Baris hoveyi – type locality for species
  • † Baris imperfecta – type locality for species
  • † Baris matura – type locality for species
  • † Baris nearctica – type locality for species
  • † Baris primalis – type locality for species
  • † Baris renovata – type locality for species
  • † Baris schucherti – type locality for species

• 

  † Barylambda
  • † Barylambda faberi – type locality for species
• † Barylypa
  • † Barylypa primigena – type locality for species
• † Bassus
  • † Bassus juvenilis – type locality for species
  • † Bassus miocenicus – type locality for species
  • † Bassus velatus – type locality for species
• † Bathornis – type locality for genus
  • † Bathornis veredus – type locality for species
• † Bathygenys
  • † Bathygenys alpha

• 

  † Bathyopsis
  • † Bathyopsis fissidens
• † Belyta
  • † Belyta mortuella – type locality for species
• Bembidion
  • † Bembidion bimaculatum
  • † Bembidion breve
  • † Bembidion coloradense
  • † Bembidion constricticolle
• † Bembidium
  • † Bembidium florissantensis – type locality for species
  • † Bembidium obductum – type locality for species
  • † Bembidium tumulorum – type locality for species
• † Beringiaphyllum
  • † Beringiaphyllum cupanioides
• † Beris
  • † Beris miocenica – type locality for species

• 

  Betula
  • † Betula stevensoni
• Bibio
  • † Bibio capnodes – type locality for species
  • † Bibio cockerelli – type locality for species
  • † Bibio excurvatus – type locality for species
  • † Bibio explanatus – type locality for species
  • † Bibio jamesi – type locality for species
  • † Bibio podager – type locality for species
  • † Bibio vetus – type locality for species
  • † Bibio vulcanius – type locality for species
  • † Bibio wickhami – type locality for species
• † Bibiodes
  • † Bibiodes intermedia – type locality for species
• † Bidessus
  • † Bidessus laminarum – type locality for species
• Bison
  • † Bison antiquus – or unidentified comparable form

  • 

    † Bison latifrons
• † Blapstinus
  • † Blapstinus linellii – type locality for species
• † Blechnum
  • † Blechnum anceps
• Bledius
  • † Bledius osborni
  • † Bledius primitiarum – type locality for species
  • † Bledius soli – type locality for species
  • † Bledius suturalis
• † Blickomylus
  • † Blickomylus galushai
• Boletina
  • † Boletina hypogaea – type locality for species

• 

  † Borealosuchus
• † Borophagus
  • † Borophagus pugnator
• † Bouromeryx
  • † Bouromeryx americanus – type locality for species
• † Brachinus
  • † Brachinus newberryi – type locality for species
  • † Brachinus repressus – type locality for species

• 

  † Brachycrus
• † Brachyerix
  • † Brachyerix macrotis
• Brachylagus
  • † Brachylagus coloradoensis – type locality for species
• † Brachyprotoma
  • † Brachyprotoma obtusata
• † Brachypsalis
  • † Brachypsalis modicus
• † Brachyrhynchocyon
• † Brachyspathus – type locality for genus
  • † Brachyspathus curiosus – type locality for species
• † Brachytarsus – tentative report
  • † Brachytarsus dubius – type locality for species
• Bracon
  • † Bracon abstractus – type locality for species
  • † Bracon cockerelli – type locality for species
  • † Bracon resurrectus – type locality for species

• 

  † Bruchus
  • † Bruchus aboriginalis – type locality for species
  • † Bruchus anilis – type locality for species
  • † Bruchus antaeus – type locality for species
  • † Bruchus bowditchi – type locality for species
  • † Bruchus carpophiloides – type locality for species
  • † Bruchus dormescens – type locality for species
  • † Bruchus exhumatus – type locality for species
  • † Bruchus henshawi – type locality for species
  • † Bruchus osborni – type locality for species
  • † Bruchus succintus – type locality for species
• † Bruesisca
  • † Bruesisca submersus – type locality for species
• Bubo

  • 

    † Bubo virginianus
• Bufo
  • † Bufo cognatus
  • † Bufo douglassi
  • † Bufo woodhousei
• † Bunophorus
  • † Bunophorus grangeri
  • † Bunophorus pattersoni
  • † Bunophorus robustus
  • † Bunophorus sinclairi
• † Buprestis
  • † Buprestis florissantensis – type locality for species
  • † Buprestis megistarche – type locality for species
  • † Buprestis scudderi – type locality for species
• † Bursera
  • † Bursera serrulata

• 

  Buteo
  • † Buteo fluviaticus – type locality for species
• Byrrhus
  • † Byrrhus eximius
  • † Byrrhus romingeri
• † Bythoscopus
  • † Bythoscopus lapidescens – type locality for species

C

• † Cacalydus – type locality for genus
  • † Cacalydus exstirpatus – type locality for species
  • † Cacalydus lapsus – type locality for species
• † Cacogaster – type locality for genus
  • † Cacogaster novamaculatus – type locality for species
• † Cacoschistus – type locality for genus
  • † Cacoschistus maceriatus – type locality for species
• † Caenocholax
  • † Caenocholax barkleyi – type locality for species
  • † Caenocholax palusaxus – type locality for species

• 

  † Caesalpinia
  • † Caesalpinia pecorae
• † Caesalpinites
  • † Caesalpinites acuminatus
  • † Caesalpinites coloradicus
• † Calamagras – type locality for genus
  • † Calamagras angulatus – type locality for species
  • † Calamagras murivorus – type locality for species
  • † Calamagras talpivorus – type locality for species
• † Calandrites
  • † Calandrites cineratius
  • † Calandrites defessus
  • † Calandrites hindsi – type locality for species
  • † Calandrites ursorum – type locality for species
• † Calcarius

  • 

    † Calcarius lapponicus
  • † Calcarius ornatus
• † Calippus
  • † Calippus regulus
• † Caliroa
  • † Caliroa micrarche – type locality for species
  • † Caliroa mimus – type locality for species
  • † Caliroa revelata – type locality for species
• † Callidiopsites – type locality for genus
  • † Callidiopsites grandiceps – type locality for species
• † Callimoxys
  • † Callimoxys primordialis – type locality for species
• † Callomyia – tentative report
  • † Callomyia hypolitha – type locality for species
• Calosoma
  • † Calosoma calvini – type locality for species
  • † Calosoma cockerelli – type locality for species
  • † Calosoma emmonsi – type locality for species
• † Calyptapis – type locality for genus
  • † Calyptapis florissantensis – type locality for species

• 

  † Camelops
  • † Camelops hesternus
• † Camerotops
  • † Camerotops solidatus – type locality for species
• Camponotus
  • † Camponotus fuscipennis – type locality for species
  • † Camponotus microcephalus – type locality for species
  • † Camponotus petrifactus – type locality for species
• Canis
  • † Canis edwardii – or unidentified comparable form
  • † Canis latrans
• † Cantius
  • † Cantius abditus
  • † Cantius frugivorus
  • † Cantius mckennai
  • † Cantius ralstoni
• † Capnobotes
  • † Capnobotes silens
• † Capnochroa
  • † Capnochroa senilis – type locality for species
• † Capsus
  • † Capsus lacus – type locality for species
  • † Capsus obsolefactus – type locality for species
• † Carabites – tentative report
  • † Carabites arapahoensis – type locality for species
• Carabus
  • † Carabus jeffersoni – type locality for species
• † Cardichelyon
  • † Cardichelyon rogerwoodi – or unidentified comparable form
• † Cardiolophus
  • † Cardiolophus radinskyi

• 

  † Cardiophorus
  • † Cardiophorus cockerelli – type locality for species
  • † Cardiophorus deprivatus – type locality for species
  • † Cardiophorus exhumatus – type locality for species
  • † Cardiophorus florissantensis – type locality for species
  • † Cardiophorus lithographicus – type locality for species
  • † Cardiophorus requiescens – type locality for species
• Cardiospermum

  • 

    † Cardiospermum coloradensis
  • † Cardiospermum terminalis
• † Cariblattoides
  • † Cariblattoides labandeirai – type locality for species
• † Carmelus
  • † Carmelus gravatus – type locality for species
  • † Carmelus sepositus – type locality for species
• † Carpites
  • † Carpites gemmaceus
  • † Carpites miliodes
• † Carpocyon
  • † Carpocyon compressus
  • † Carpocyon robustus
• Carpodacus
  • † Carpodacus cassinii
• † Carpodaptes
  • † Carpodaptes aulacodon – type locality for species
  • † Carpodaptes cygneus
• † Carpophilus
  • † Carpophilus restructus – type locality for species

• 

  Carya
  • † Carya antiquorum
  • † Carya florissantensis
  • † Carya libbeyi
• Castanea
  • † Castanea dolichophylla
  • † Castanea intermedia
• † Catobaris – type locality for genus
  • † Catobaris coenosa – type locality for species
• † Catopamera – type locality for genus
  • † Catopamera augheyi – type locality for species
  • † Catopamera bradleyi – type locality for species
• † Catopsalis
  • † Catopsalis alexanderi – type locality for species
• † Catopsylla – type locality for genus
  • † Catopsylla crawfordi – type locality for species
  • † Catopsylla prima – type locality for species
• † Cecidomyia – tentative report
  • † Cecidomyia pontaniiformis
• Cedrela
  • † Cedrela lancifolia
• † Cedrelospermum
  • † Cedrelospermum lineatum
• † Cedromus
  • † Cedromus wardi
• † Celastrilex – type locality for genus ^[1]
  • † Celastrilex artocarpidioides – type locality for species. Formerly classified as Celastrinites artocarpidioides. ^[1]
• † Celastrinites ^[1]
  • † Celastrilex artocarpidioides – type locality for species. Later reclassified as Celastrilex artocarpidioides. ^[1]

• 

  † Celastrus
  • † Celastrus typica
  • † Celastrus winchesteri
• Celtis
  • † Celtis mccoshii
• † Centetodon
  • † Centetodon magnus
  • † Centetodon marginalis
  • † Centetodon patratus – type locality for species
• † Centimanomys
  • † Centimanomys galbreathi
  • † Centimanomys major
• † Centrinus
  • † Centrinus hypogaeus – type locality for species
  • † Centrinus obnuptus – type locality for species
  • † Centrinus vulcanicus – type locality for species
• † Centrocerus
  • † Centrocerus urophasianus
• † Centron – type locality for genus
  • † Centron moricollis – type locality for species
• † Cephalomyrmex – type locality for genus
  • † Cephalomyrmex rotundatus – type locality for species
• † Ceratina
  • † Ceratina disrupta – type locality for species

• 

  † Ceratosuchus – type locality for genus
  • † Ceratosuchus burdoshi – type locality for species
• † Ceraturgus
  • † Ceraturgus praecursor – type locality for species
• Cercidiphyllum
  • † Cercidiphyllum arcticum
• Cercis
  • † Cercis parvifolia
• † Cercocarpus
  • † Cercocarpus myricaefolius
• † Cercopis
  • † Cercopis cephalinus – type locality for species
  • † Cercopis suffocata – type locality for species
• † Ceropalites – type locality for genus
  • † Ceropalites infelix – type locality for species
• † Ceruchus
  • † Ceruchus fuchsii – type locality for species
• Cervus

  • 

    † Cervus elaphus
• Ceutorhynchus
  • † Ceutorhynchus blaisdelli – type locality for species
  • † Ceutorhynchus clausus – type locality for species
  • † Ceutorhynchus compactus – type locality for species
  • † Ceutorhynchus degravatus – type locality for species
  • † Ceutorhynchus duratus – type locality for species
  • † Ceutorhynchus irvingi – type locality for species
• Chaetodipus
  • † Chaetodipus hispidus
• † Chaetopleurophora
  • † Chaetopleurophora laminarum – type locality for species
• † Chaetoptelea
  • † Chaetoptelea microphylla
• † Chalcis
  • † Chalcis perdita – type locality for species
  • † Chalcis praevalens
  • † Chalcis praevolans – type locality for species
  • † Chalcis tortilis – type locality for species
• † Chalepus
  • † Chalepus americanus – type locality for species
• † Chalybion
  • † Chalybion mortuum – type locality for species
• † Chamaecyparis
  • † Chamaecyparis linguaefolia

• 

  † Chamaedorea
  • † Chamaedorea danae
• † Chaneya

  • 

    † Chaneya tenuis
• Charina
  • † Charina prebottae
• † Chauliognathus
  • † Chauliognathus pristinus – type locality for species
• † Cheilophis – type locality for genus
  • † Cheilophis huerfanoensis – type locality for species
• Cheilosia
  • † Cheilosia hecate – type locality for species
  • † Cheilosia miocenica – type locality for species
  • † Cheilosia scudderi – type locality for species
  • † Cheilosia sepultula – type locality for species
• † Chelonarium
  • † Chelonarium montanum – type locality for species
• † Chelonus
  • † Chelonus depressus – type locality for species
  • † Chelonus muratus – type locality for species
  • † Chelonus solidus – type locality for species
• † Chilocorus
  • † Chilocorus ulkei – type locality for species
• † Chionaemopsis – type locality for genus
  • † Chionaemopsis quadrifasciatus – type locality for species
• † Chiromyoides
  • † Chiromyoides caesor
  • † Chiromyoides gigas
  • † Chiromyoides potior – type locality for species

• 

  Chironomus
  • † Chironomus almelanderi – type locality for species
  • † Chironomus depletus – type locality for species
  • † Chironomus patens – type locality for species
  • † Chironomus pausatus – type locality for species
  • † Chironomus primaevus – type locality for species
  • † Chironomus pristinus – type locality for species
  • † Chironomus proterus – type locality for species
  • † Chironomus requiescens – type locality for species
  • † Chironomus scudderiellus – type locality for species
• Chondestes
  • † Chondestes grammacus
• † Chriacus
  • † Chriacus gallinae
• † Chrysis
  • † Chrysis miocenica – type locality for species
  • † Chrysis rohweri – type locality for species
• † Chrysobothris
  • † Chrysobothris coloradensis – type locality for species
  • † Chrysobothris gahani – type locality for species
  • † Chrysobothris haydeni – type locality for species
  • † Chrysobothris suppressa – type locality for species
• † Chrysogaster
  • † Chrysogaster antiquarius – type locality for species
• Chrysomela
  • † Chrysomela vesperalis – type locality for species
• † Cicada
  • † Cicada grandiosa – type locality for species
• † Cicadella
  • † Cicadella scudderi – type locality for species
• † Cimbex
  • † Cimbex vetusculus – type locality for species
• † Cimexomys
  • † Cimexomys arapahoensis – type locality for species
  • † Cimexomys minor

• 

  Cinnamomum
  • † Cinnamomum sezannense
• † Cissites
  • † Cissites rocklandensis
• Cissus
  • † Cissus marginata
• † Cixius – tentative report
  • † Cixius proavus – type locality for species
• † Cladius
  • † Cladius petrinus – type locality for species
• † Cladoneura – type locality for genus
  • † Cladoneura willistoni – type locality for species
• † Cladura
  • † Cladura integra – type locality for species
  • † Cladura maculata – type locality for species
• † Clastoptera
  • † Clastoptera comstocki – type locality for species

• 

  † Cleonus
  • † Cleonus degeneratus – type locality for species
  • † Cleonus estriatus – type locality for species
  • † Cleonus exterraneus – type locality for species
  • † Cleonus foersteri – type locality for species
  • † Cleonus primoris – type locality for species
  • † Cleonus rohweri – type locality for species
• † Closterocoris
  • † Closterocoris elegans – type locality for species
• † Clubiona
  • † Clubiona arcana
  • † Clubiona curvispinosa – type locality for species
  • † Clubiona eversa – type locality for species
  • † Clubiona florissanti – type locality for species
• † Clytus
  • † Clytus pervetustus – type locality for species

• 

  † Coccinella
  • † Coccinella florissantensis – type locality for species
  • † Coccinella sodoma – type locality for species
• † Coccotorus
  • † Coccotorus principalis – type locality for species
  • † Coccotorus requiescens – type locality for species
• † Coeliodes
  • † Coeliodes primotinus – type locality for species
• Colaptes
  • † Colaptes auratus
• † Colaspis
  • † Colaspis aetatis – type locality for species
  • † Colaspis diluvialis – type locality for species
  • † Colaspis proserpina – type locality for species
• † Colastes
  • † Colastes abrogatus – type locality for species
• † Colemanus – type locality for genus
  • † Colemanus keeleyorum – type locality for species
• † Collops
  • † Collops desuetus – type locality for species
  • † Collops extrusus – type locality for species
  • † Collops priscus – type locality for species
• † Colopterus
  • † Colopterus pygidialis – type locality for species
• † Colpoclaenus
  • † Colpoclaenus keeferi

• 

  † Colubrina
  • † Colubrina spireaefolia
  • † Colubrina spireafollia
• † Compsemys
  • † Compsemys victa
• † Comptosia – type locality for genus
  • † Comptosia miranda – type locality for species
• † Conacodon
  • † Conacodon delphae – type locality for species
  • † Conacodon harbourae – type locality for species
  • † Conacodon matthewi – type locality for species
• † Coniatus
  • † Coniatus refractus
• Conotelus
  • † Conotelus obscurus

• 

  † Conotrachelus
  • † Conotrachelus florissantensis – type locality for species
• † Contogenys – or unidentified related form
• † Convolvulites
  • † Convolvulites orichitus
• † Conzattia
  • † Conzattia coriacea – type locality for species
• † Copecion
  • † Copecion brachypternus
• † Copelemur
  • † Copelemur praetutus
• † Cophocoris – type locality for genus
  • † Cophocoris tenebricosus – type locality for species
• † Cophura
  • † Cophura antiquella – type locality for species
• † Copidita
  • † Copidita miocenica – type locality for species
• † Coptochromus – type locality for genus
  • † Coptochromus manium – type locality for species
• † Cordilura
  • † Cordilura exhumata – type locality for species
• † Corethra
  • † Corethra exita – type locality for species
• Corixa
  • † Corixa immersa – type locality for species
  • † Corixa vanduzeei – type locality for species
• † Corizus
  • † Corizus abditivus – type locality for species
  • † Corizus celatus – type locality for species
  • † Corizus somnurnus – type locality for species
• † Cormocyon
  • † Cormocyon copei

• 

  † Cormohipparion
  • † Cormohipparion quinni
  • † Cormohipparion sphenodus
• Cornus
  • † Cornus hyperborea
• † Corphyra
  • † Corphyra calypso – type locality for species
• Corticaria
  • † Corticaria aeterna – type locality for species
  • † Corticaria egregia – type locality for species
  • † Corticaria occlusa – type locality for species
  • † Corticaria petrefacta – type locality for species
• Corvus
  • † Corvus brachyrhynchos
  • † Corvus corax
• † Corylus
  • † Corylus insignis

• 

  † Coryphodon
  • † Coryphodon armatus
  • † Coryphodon eocaenus
• Cossonus
  • † Cossonus gabbii – type locality for species
  • † Cossonus rutus – type locality for species
• † Cotinus
  • † Cotinus fraterna
• † Crabro
  • † Crabro longaevus – type locality for species
• † Cratacanthus
  • † Cratacanthus florissantensis – type locality for species

• 

  Crataegus
  • † Crataegus copeana
  • † Crataegus hendersoni
  • † Crataegus nupta
• † Cremastorhynchus
  • † Cremastorhynchus stabilis
• † Cremastosaurus – type locality for genus
  • † Cremastosaurus carinicollis – type locality for species
  • † Cremastosaurus rhambastes – type locality for species
• † Cremnops
  • † Cremnops florissanticola – type locality for species
• † Creniphilites – type locality for genus
  • † Creniphilites orpheus – type locality for species
• † Crioceridea – type locality for genus
  • † Crioceridea dubia – type locality for species
• Crotalus

  • 

    † Crotalus viridis
• †Croton
  • † Croton furculatum
• † Cryptagriotes – type locality for genus
  • † Cryptagriotes minusculus – type locality for species
• † Cryptocephalus
  • † Cryptocephalus miocenus – type locality for species
• † Cryptocheilus
  • † Cryptocheilus florissantensis – type locality for species
  • † Cryptocheilus hypogaeus – type locality for species
  • † Cryptocheilus laminarum – type locality for species
  • † Cryptocheilus scudderi – type locality for species
  • † Cryptocheilus senex – type locality for species
• † Cryptochromus – type locality for genus
  • † Cryptochromus letatus – type locality for species
• Cryptohypnus
  • † Cryptohypnus exterminatus – type locality for species
  • † Cryptohypnus hesperus – type locality for species

• 

  Cryptophagus
  • † Cryptophagus bassleri – type locality for species
  • † Cryptophagus petricola – type locality for species
  • † Cryptophagus scudderi – type locality for species
• Cryptorhynchus
  • † Cryptorhynchus annosus
  • † Cryptorhynchus coloradensis – type locality for species
  • † Cryptorhynchus durus – type locality for species
  • † Cryptorhynchus evinctus – type locality for species
  • † Cryptorhynchus fallii – type locality for species
  • † Cryptorhynchus kerri – type locality for species
  • † Cryptorhynchus profusus – type locality for species
• † Cryptus
  • † Cryptus delineatus – type locality for species
• † Ctereacoris – type locality for genus
  • † Ctereacoris primigenus – type locality for species

• 

  Culex
  • † Culex winchesteri – type locality for species
• † Curculio
  • † Curculio anicularis – type locality for species
  • † Curculio beeklyi – type locality for species
  • † Curculio curvirostris – type locality for species
  • † Curculio duttoni – type locality for species
  • † Curculio extinctus – type locality for species
  • † Curculio femoratus
  • † Curculio flexirostris – type locality for species
  • † Curculio florissantensis – type locality for species
  • † Curculio minusculoides – type locality for species
  • † Curculio minusculus
  • † Curculio restrictus – type locality for species
• † Cursoricoccyx – type locality for genus
  • † Cursoricoccyx geraldinae – type locality for species
• † Cuterebra
  • † Cuterebra ascarides – type locality for species
  • † Cuterebra bibosa – type locality for species
• † Cychramites – type locality for genus
  • † Cychramites hirtus – type locality for species
• † Cyclotrachelus
  • † Cyclotrachelus tenebricus – type locality for species
• † Cydamus
  • † Cydamus robustus – type locality for species
• † Cydnopsis
  • † Cydnopsis handlirschi – type locality for species
• † Cylindrodon
  • † Cylindrodon nebraskensis
• † Cylindrotoma
  • † Cylindrotoma veterana – type locality for species
• † Cynarctoides
  • † Cynarctoides acridens

• 

  † Cynelos
• Cynomys
  • † Cynomys niobrarius
  • † Cynomys spenceri – or unidentified comparable form
• † Cyperacites
  • † Cyperacites lacustris – type locality for species
• † Cyphomyia
  • † Cyphomyia rohweri – type locality for species
• Cyphon
• † Cyphus
  • † Cyphus florissantensis – type locality for species
• † Cypris
  • † Cypris florissantensis – type locality for species
• † Cyrtapis – type locality for genus
  • † Cyrtapis anomala – type locality for species
• † Cyrtomon
  • † Cyrtomon subterraneus – type locality for species
• Cytilus
  • † Cytilus tartarinus – type locality for species
• † Cyttaromyia
  • † Cyttaromyia obdurescens – type locality for species
  • † Cyttaromyia princetoniana – type locality for species
  • † Cyttaromyia reclusa – type locality for species

D

• † Daphne
  • † Daphne septentrionalis
• Daphnia

• 

  † Daphoenus
  • † Daphoenus vetus
• † Dartonius
  • † Dartonius jepseni
• † Dascillus
  • † Dascillus lithographicus – type locality for species
• † Davidia
  • † Davidia antiqua
• † Deleaster
  • † Deleaster grandiceps – type locality for species
• † Delphax
  • † Delphax senilis – type locality for species
  • † Delphax veterum – type locality for species
• † Demophorus
  • † Demophorus antiquus – type locality for species
• † Denaeaspis – type locality for genus
  • † Denaeaspis chelonopsis – type locality for species
• † Dendragopus
  • † Dendragopus obscurus

• 

  † Dennstaedtia
  • † Dennstaedtia americana
• † Denverus – type locality for genus
  • † Denverus middletoni – type locality for species
• † Dermatobia
  • † Dermatobia hydropica – type locality for species
• † Dermestes
  • † Dermestes tertiarius – type locality for species
• † Derobrochus – type locality for genus
  • † Derobrochus abstractus – type locality for species
  • † Derobrochus caenulentus – type locality for species
  • † Derobrochus commoratus – type locality for species
  • † Derobrochus craterae – type locality for species
  • † Derobrochus frigescens – type locality for species
  • † Derobrochus marcidus – type locality for species
  • † Derobrochus typharum – type locality for species
• † Desmatoclaenus
  • † Desmatoclaenus protogonioides – or unidentified comparable form
• † Desmatomyia – type locality for genus
  • † Desmatomyia scopulicornis – type locality for species
• † Detyopsis – type locality for genus
  • † Detyopsis packardi – type locality for species
  • † Detyopsis scudderi – type locality for species
• † Deviacer
• † Diabrotica
  • † Diabrotica bowditchiana – type locality for species
  • † Diabrotica exesa – type locality for species
  • † Diabrotica florissantella – type locality for species
  • † Diabrotica uteana – type locality for species

• 

  † Diacodexis
  • † Diacodexis kelleyi
  • † Diacodexis metsiacus – or unidentified comparable form
  • † Diacodexis minutus
  • † Diacodexis primus
  • † Diacodexis secans – or unidentified comparable form
• † Diacodon
  • † Diacodon alticuspis – or unidentified comparable form
• † Dialysis
  • † Dialysis revelata – type locality for species
• Dialytes
• Dialytodius
  • † Dialytodius decipiens
• Diamesa
  • † Diamesa extincta – type locality for species
• † Dianthidium
  • † Dianthidium tertiarium – type locality for species
• † Diaplegma – type locality for genus
  • † Diaplegma abductum – type locality for species
  • † Diaplegma haldemani – type locality for species
  • † Diaplegma occultorum – type locality for species
  • † Diaplegma ruinosum – type locality for species
  • † Diaplegma venerabile – type locality for species
  • † Diaplegma veterascens – type locality for species

• 

  † Diceratherium
  • † Diceratherium tridactylum
• † Dicerca
  • † Dicerca eurydice – type locality for species
• Dicranomyia
  • † Dicranomyia faecarius – type locality for species
  • † Dicranomyia fontainei – type locality for species
  • † Dicranomyia fragilis – type locality for species
  • † Dicranomyia inferna – type locality for species
  • † Dicranomyia loewi – type locality for species
  • † Dicranomyia longipes – type locality for species
  • † Dicranomyia primitiva
  • † Dicranomyia rohweri – type locality for species
  • † Dicranomyia saxetana – type locality for species
  • † Dicranomyia stagnorum
  • † Dicranomyia stigmosa

• 

  † Dicranota
  • † Dicranota cockerelli – type locality for species
• † Dictyla
  • † Dictyla veterana – type locality for species
• † Dictyophara
  • † Dictyophara bouvei – type locality for species
• † Dictyoraphidia
  • † Dictyoraphidia veterana – type locality for species
• † Didelphodus
  • † Didelphodus absarokae
  • † Didelphodus altidens
• † Didymictis
  • † Didymictis altidens
  • † Didymictis leptomylus
  • † Didymictis protenus
  • † Didymictis proteus – or unidentified comparable form
  • † Didymictis vancleveae
• † Didymosphaeria
  • † Didymosphaeria betheli
• † Dikkomys
• † Dilaropsis – type locality for genus
  • † Dilaropsis ornatus – type locality for species
• † Dillenites
  • † Dillenites garfieldensis
• † Dilophodon
• † Dineura
  • † Dineura cockerelli – type locality for species
  • † Dineura fuscipennis – type locality for species
  • † Dineura laminarum – type locality for species
  • † Dineura microsoma – type locality for species
  • † Dineura saxorum – type locality for species

• 

  † Dinictis
• † Dinidorites – type locality for genus
  • † Dinidorites margiformis – type locality for species
• † Dinoderus
  • † Dinoderus cuneicollis – type locality for species
• † Dinohippus
  • † Dinohippus interpolatus – or unidentified comparable form
• † Dioctria
  • † Dioctria florissantina – type locality for species
  • † Dioctria pulveris – type locality for species
• Dioscorea
• † Diplodipelta – type locality for genus
  • † Diplodipelta reniptera
• † Diplolophus
  • † Diplolophus insolens
• † Diploptera
  • † Diploptera gemini – type locality for species
  • † Diploptera savba – type locality for species
  • † Diploptera vladimir – type locality for species
• Diplotaxis – tentative report
• Diplotaxis
  • † Diplotaxis aurora – type locality for species
  • † Diplotaxis simplicipes – type locality for species
• Dipodomys

  • 

    † Dipodomys ordii
• † Dipsalidictis
  • † Dipsalidictis transiens
• Dipteronia
  • † Dipteronia brownii
  • † Dipteronia insignis
• † Dissacus
  • † Dissacus navajovius
• † Docimus – type locality for genus
  • † Docimus psylloides – type locality for species
• † Docirhynchus
  • † Docirhynchus terebrans – type locality for species
• Dodonaea
  • † Dodonaea umbrina

• 

  Dolichoderus
  • † Dolichoderus antiquus – type locality for species
  • † Dolichoderus kohlsi – type locality for species
  • † Dolichoderus rohweri – type locality for species
• † Dolichomyia
  • † Dolichomyia tertiaria – type locality for species
  • † Dolichomyia testea – type locality for species
• Dolurgus
  • † Dolurgus pumilus
• † Dombeyopsis
  • † Dombeyopsis magnifica
• † Dominickus – type locality for genus
  • † Dominickus castnioides – type locality for species
• † Domnina
  • † Domnina gradata
  • † Domnina thompsoni – or unidentified comparable form
• † Domninoides
• Donacia
• Dorytomus
  • † Dorytomus coercitus – type locality for species
  • † Dorytomus williamsi – type locality for species
• † Doxocopa
  • † Doxocopa wilmattae – type locality for species
• † Drassonax
  • † Drassonax harpagops – type locality for species
• † Drepanomeryx – tentative report
  • † Drepanomeryx falciformis

• 

  † Dromomeryx
  • † Dromomeryx borealis – type locality for species
• † Dryobius
  • † Dryobius miocenicus – type locality for species
• Dryocoetes – type locality for genus
  • † Dryocoetes diluvialis – type locality for species
• Dryopteris
  • † Dryopteris guyottii
  • † Dryopteris lakesi
  • † Dryopteris serrata
• Dyschirius
• † Dyscoletes
  • † Dyscoletes soporatus – type locality for species
• † Dysdercus
  • † Dysdercus cinctus – type locality for species
  • † Dysdercus unicolor – type locality for species
• † Dyspetochrysa
  • † Dyspetochrysa vetuscula – type locality for species

E

• † Earinus
  • † Earinus saxatilis – type locality for species
• † Ecclesimus
  • † Ecclesimus tenuiceps
• † Echinaphis – type locality for genus
  • † Echinaphis rohweri – type locality for species

• 

  † Echmatemys
  • † Echmatemys lativertebralis – or unidentified comparable form
  • † Echmatemys septaria
  • † Echmatemys stevensoniana – tentative report
• † Ectobius
  • † Ectobius kohlsi – type locality for species
• † Ectocion
  • † Ectocion major
  • † Ectocion medituber
  • † Ectocion osbornianus
  • † Ectocion parvus
• † Ectoconus
  • † Ectoconus ditrigonus
• † Ectoganus
  • † Ectoganus lobdelli
• † Ectopria
  • † Ectopria laticollis – type locality for species
• † Ectypodus
  • † Ectypodus childei – or unidentified comparable form
  • † Ectypodus musculus – type locality for species
  • † Ectypodus tardus
• † Elaeomyrmex – type locality for genus
  • † Elaeomyrmex coloradensis – type locality for species
  • † Elaeomyrmex gracilis – type locality for species
• † Elaphidion
  • † Elaphidion fracticorne – type locality for species
• Elaphropus
  • † Elaphropus incurvus
• † Elater
  • † Elater florissantensis – type locality for species
  • † Elater rohweri – type locality for species
  • † Elater scudderi – type locality for species
• Eleodes
  • † Eleodes granulatus – or unidentified comparable form
• † Elidiptera
  • † Elidiptera regularis – type locality for species
• †Emiliana – type locality for genus
  • † Emiliana alexandri – type locality for species

• 

  † Empis
  • † Empis florissantana – type locality for species
  • † Empis infossa – type locality for species
  • † Empis miocenica – type locality for species
  • † Empis perdita – type locality for species
• † Enallagma
  • † Enallagma florissantella – type locality for species
  • † Enallagma mortuella – type locality for species
  • † Enallagma oblisum – type locality for species
• Engelhardtia
  • † Engelhardtia uintaensis – type locality for species
• Enochrus
  • † Enochrus hamiltoni
  • † Enochrus scudderi – type locality for species
• † Entimus
  • † Entimus primordialis – type locality for species

• 

  † Eobasileus
  • † Eobasileus cornutus
• † Eobruneria – type locality for genus
  • † Eobruneria tessellata – type locality for species
• † Eobumbatrix
  • † Eobumbatrix latebrosa – type locality for species
• † Eocleonus – type locality for genus
  • † Eocleonus subjectus – type locality for species
• † Eocuculus – type locality for genus
  • † Eocuculus cherpinae – type locality for species
• † Eodiplurina – type locality for genus
  • † Eodiplurina cockerelli – type locality for species
• † Eoerianthus – type locality for genus
  • † Eoerianthus eocaenicus – type locality for species
  • † Eoerianthus multispinosa – type locality for species
• † Eoformica – type locality for genus
  • † Eoformica globularis – type locality for species
  • † Eoformica magna – type locality for species
  • † Eoformica pinguis – type locality for species
• † Eofulgorella – type locality for genus
  • † Eofulgorella bradburyi – type locality for species
• † Eoglyptosaurus
  • † Eoglyptosaurus donohoei
• † Eogryllus
  • † Eogryllus elongatus – type locality for species
  • † Eogryllus unicolor – type locality for species
• † Eohemichroa
  • † Eohemichroa eophila – type locality for species

• 

  † Eohippus
  • † Eohippus angustidens
• † Eolestes – type locality for genus
  • † Eolestes syntheticus – type locality for species
• † Eoliarus – type locality for genus
  • † Eoliarus quadristictus – type locality for species
• † Eomerope – type locality for genus
  • † Eomerope tortriciformis – type locality for species
• † Eomogoplistes – type locality for genus
  • † Eomogoplistes longipennis – type locality for species
• † Eomyza – type locality for genus
  • † Eomyza holoptera – type locality for species
• † Eopachylosticta
  • † Eopachylosticta byrami – type locality for species
• † Eophlebomyia – type locality for genus
  • † Eophlebomyia claripennis – type locality for species
• † Eopimpla – type locality for genus
  • † Eopimpla grandis – type locality for species
• † Eosacantha – type locality for genus
  • † Eosacantha delocranioides – type locality for species
• † Eostentatrix
  • † Eostentatrix cockerelli – type locality for species
  • † Eostentatrix ostentata – type locality for species
• † Eotetrix – type locality for genus
  • † Eotetrix unicornis – type locality for species
• † Eothes – type locality for genus
  • † Eothes elegans – type locality for species
• † Eotingis – type locality for genus
  • † Eotingis antennata – type locality for species

• 

  † Eotitanops
  • † Eotitanops borealis
• † Eotrella – type locality for genus
  • † Eotrella mira – type locality for species
• † Eotylopus
• † Eozacla
  • † Eozacla arachnomorpha – type locality for species
  • † Eozacla problematica – type locality for species
• † Epallagites – type locality for genus
  • † Epallagites avus – type locality for species
• † Epanuraea – type locality for genus
  • † Epanuraea ingenita – type locality for species
• † Ephalus
  • † Ephalus adumbratus – type locality for species

• 

  Ephedra
  • † Ephedra miocenica
• † Ephemera
  • † Ephemera exsucca – type locality for species
  • † Ephemera howarthi – type locality for species
  • † Ephemera immobilis – type locality for species
  • † Ephemera interempta – type locality for species
  • † Ephemera macilenta – type locality for species
  • † Ephemera pumicosa – type locality for species
  • † Ephemera tabifica – type locality for species
• † Epicaerus
  • † Epicaerus effossus
  • † Epicaerus eradicatus
  • † Epicaerus evigoratus
  • † Epicaerus exanimis
  • † Epicaerus excissus – type locality for species
  • † Epicaerus saxatilis
  • † Epicaerus subterraneus
  • † Epicaerus terrosus
• Epicauta
  • † Epicauta subneglecta – type locality for species

• 

  † Epicyon
  • † Epicyon haydeni
• † Epihippus
  • † Epihippus gracilis
• † Epiphloeus
  • † Epiphloeus pristinus – type locality for species
• Epuraea
  • † Epuraea planulata
• † Epyris
  • † Epyris deletus – type locality for species
• † Equisetum
  • † Equisetum florissantense
  • † Equisetum winchesteri
• Equus
  • † Equus conversidens
  • † Equus francisci
  • † Equus scotti – or unidentified comparable form

  • 

    † Equus simplicidens
• Eremophila
  • † Eremophila alpestris
• Erethizon
• Eriocampa
  • † Eriocampa bruesi – type locality for species
  • † Eriocampa celata – type locality for species
  • † Eriocampa disjecta – type locality for species
  • † Eriocampa pristina – type locality for species
  • † Eriocampa scudderi – type locality for species
  • † Eriocampa synthetica – type locality for species
• † Eriophyes – tentative report
  • † Eriophyes beutenmulleri
• † Eristalis
  • † Eristalis lapideus – type locality for species
• † Ernobius
  • † Ernobius effetus – type locality for species
• † Erycus
  • † Erycus brevicollis – type locality for species
• † Esthonyx
  • † Esthonyx acutidens
  • † Esthonyx bisulcatus
  • † Esthonyx spatularius
• † Eterochalcis
  • † Eterochalcis scudderi – type locality for species

• 

  † Ethmia
  • † Ethmia mortuella – type locality for species
• † Etirocoris – type locality for genus
  • † Etirocoris infernalis – type locality for species
• † Eubazus
  • † Eubazus wilmattae – type locality for species
• † Eucallimyia
  • † Eucallimyia fortis – type locality for species
• † Eucicones
  • † Eucicones oblongopunctata – type locality for species
• Eucnecosum
  • † Eucnecosum brachypterum
  • † Eucnecosum brunnescens
  • † Eucnecosum tenue
• † Eucnemis
  • † Eucnemis antiquatus – type locality for species

• 

  † Eucommia
  • † Eucommia serrata
• † Eucorites – type locality for genus
  • † Eucorites serescens – type locality for species
• † Eudasytites – type locality for genus
  • † Eudasytites listriformis – type locality for species
• † Eudomus
  • † Eudomus pinguis
  • † Eudomus robustus
• Eugenia
  • † Eugenia americana
  • † Eugenia arenaceaeformis
• † Eugnamptidea – type locality for genus
  • † Eugnamptidea florissantensis – type locality for species
  • † Eugnamptidea robusta – type locality for species
  • † Eugnamptidea tertiaria – type locality for species
• † Eulithomyrmex – type locality for genus

  • 

    † Eulithomyrmex rugosus – type locality for species
  • † Eulithomyrmex striatus – type locality for species
• † Eumys
  • † Eumys brachyodus
  • † Eumys elegans
• † Euparius
  • † Euparius adumbratus – type locality for species
  • † Euparius arcessitus – type locality for species
• Euphorbia
  • † Euphorbia minuta
• † Euphorus
  • † Euphorus indurescens – type locality for species
• † Eurhinus
  • † Eurhinus occultus – type locality for species
• † Euroxenomys
• † Eurytoma
  • † Eurytoma sepulta – type locality for species
  • † Eurytoma sequax – type locality for species
• Eutamias

  • 

    † Eutamias minimus – or unidentified comparable form
• † Eutrichopleurus
  • † Eutrichopleurus miocenus – type locality for species
• † Eutypomys
  • † Eutypomys parvus
• † Evopes
  • † Evopes occubatus – type locality for species
  • † Evopes veneratus – type locality for species
• Exechia
  • † Exechia priscula – type locality for species
• † Exenterus
  • † Exenterus dormitans – type locality for species
• † Exetastes
  • † Exetastes inveteratus – type locality for species
• † Exitelus – type locality for genus
  • † Exitelus exsanguis – type locality for species
• † Exochilum
  • † Exochilum inusitatum – type locality for species
• † Exochus
  • † Exochus captus – type locality for species
• † Exostinus – type locality for genus
  • † Exostinus serratus – type locality for species

F

• † Fagopsis
  • † Fagopsis longifolia
• Falcipennis
  • † Falcipennis canadenis
• Falco

  • 

    † Falco sparverius
• † Fenusa – type locality for genus
  • † Fenusa parvus – type locality for species
  • † Fenusa primula – type locality for species
• † Fibla
  • † Fibla exusta – type locality for species
• Ficus
  • † Ficus affinis
  • † Ficus artocarpoides
  • † Ficus bruesi
  • † Ficus florissantella
  • † Ficus florissantia
  • † Ficus minutidens
  • † Ficus planicostata
  • † Ficus subtruncata
  • † Ficus uncata
• † Figites
  • † Figites solus – type locality for species
• † Florimena – type locality for genus
  • † Florimena impressa – type locality for species
• † Floriscolia – type locality for genus
  • † Floriscolia relicta – type locality for species
• † Florissantia (planthopper) – type locality for genus ^[2]
  • † Florissantia elegans – type locality for species

• 

  † Florissantia (plant) – type locality for genus
  • † Florissantia speirii
• † Florissantinus – type locality for genus
  • † Florissantinus angulatus – type locality for species
• † Florissantoraphidia
  • † Florissantoraphidia funerata – type locality for species
  • † Florissantoraphidia mortua – type locality for species
• > Formica
  • † Formica cockerelli – type locality for species
  • † Formica grandis – type locality for species
  • † Formica neorufibarbis
  • † Formica robusta – type locality for species
• † Fornax
  • † Fornax relictus – type locality for species
• † Frangulops – type locality for genus ^[1]
  • † Frangulops pseudostenophylla – type locality for species. Formerly known as Ilex pseudostenophylla. ^[1]
• † Franimys – tentative report
• † Fraxinus
  • † Fraxinus eocenica
• Fulgora
  • † Fulgora obticescens – type locality for species
• Fulica

  • 

    Fulica americana
• † Fuscus – tentative report
  • † Fuscus faecatus – type locality for species

G

• † Galesimorpha
  • † Galesimorpha wheeleri – type locality for species
• † Gastrallanobium – type locality for genus
  • † Gastrallanobium subconfusum – type locality for species
• † Gaurotes
  • † Gaurotes striatopunctatus – type locality for species
• † Gelastops
  • † Gelastops parcus
• † Geocoris
  • † Geocoris infernorum – type locality for species
• Geodromicus
  • † Geodromicus abditus – type locality for species
• Geomys

  • 

    † Geomys bursarius
• † Geotiphia – type locality for genus
  • † Geotiphia foxiana – type locality for species
  • † Geotiphia halictina – type locality for species
  • † Geotiphia pachysoma – type locality for species
  • † Geotiphia sternbergi – type locality for species
• † Geralophus
  • † Geralophus antiquarius
  • † Geralophus discessus – type locality for species
  • † Geralophus fossicius
  • † Geralophus lassatus
  • † Geralophus occultus
  • † Geralophus pumiceus – type locality for species
  • † Geralophus repositus
  • † Geralophus retritus – type locality for species
  • † Geralophus saxuosus – type locality for species
  • † Geralophus scudderi – type locality for species
• † Geranchon – type locality for genus
  • † Geranchon davisii – type locality for species
• † Geron – tentative report
  • † Geron platysoma – type locality for species
• † Geroncolabis
  • † Geroncolabis commixta – type locality for species
  • † Geroncolabis tertiaria – type locality for species
• Gerris
  • † Gerris protobates – type locality for species

• 

  † Gigantocamelus
• † Glossina – type locality for genus
  • † Glossina oligocenus – type locality for species
  • † Glossina osborni – type locality for species
• † Glypta
  • † Glypta aurora – type locality for species
• † Glyptosaurus
  • † Glyptosaurus sylvestris
• † Glyptostrobu
  • † Glyptostrobu nordenskioldi
• Glyptostrobus
  • † Glyptostrobus nordenskioldi
• † Gnathium
  • † Gnathium aetatis – type locality for species
• Gnophomyia
  • † Gnophomyia seiverti – type locality for species
• † Gomphocerus
  • † Gomphocerus abstrusus – type locality for species

• 

  † Gomphotherium
  • † Gomphotherium obscurum
• † Gonodera
  • † Gonodera antiqua – type locality for species
  • † Gonodera vulcanica – type locality for species
• † Gorytes
  • † Gorytes archoryctes – type locality for species
• † Grammoptera
  • † Grammoptera nanella – type locality for species
• † Gregorymys
  • † Gregorymys larsoni
• † Gryllacris
  • † Gryllacris cineris – type locality for species
  • † Gryllacris mutilata – type locality for species

• 

  † Gyaclavator – type locality for genus
  • † Gyaclavator kohlsi – type locality for species
• † Gymnetron
  • † Gymnetron antecurrens – type locality for species
• † Gymnopternus
  • † Gymnopternus lacustris – type locality for species
• † Gymnorhinus
  • † Gymnorhinus cyanocephatus
• † Gypona
  • † Gypona cinercia – type locality for species
• † Gyrophaena
  • † Gyrophaena saxicola – type locality for species

H

• † Hadrianus
  • † Hadrianus corsoni
• † Hadronema
  • † Hadronema cinerescens – type locality for species
• Halesia
  • † Halesia reticulata
• † Hammapteryx
  • † Hammapteryx ceryniiformis – type locality for species
  • † Hammapteryx lepidoides – type locality for species
  • † Hammapteryx tripunctata – type locality for species

• 

  † Hapalodectes
  • † Hapalodectes leptognathus – or unidentified comparable form
• † Haplaletes
  • † Haplaletes pelicatus
• † Haploconus
  • † Haploconus entoconus – or unidentified comparable form
• † Haplolambda
  • † Haplolambda quinni
• † Haplomylus
  • † Haplomylus simpsoni
  • † Haplomylus speirianus
• Harpalus
  • † Harpalus maceratus – type locality for species
  • † Harpalus nuperus – type locality for species
  • † Harpalus redivivus – type locality for species
  • † Harpalus ulomaeformis – type locality for species
  • † Harpalus veterum – type locality for species
  • † Harpalus whitfieldii
• † Harrymys
• † Heeria – type locality for genus
  • † Heeria foeda – type locality for species
  • † Heeria gulosa – type locality for species
  • † Heeria lapidosa – type locality for species
• † Helaletes
  • † Helaletes nanus – or unidentified comparable form
• † Helichus
  • † Helichus eruptus – type locality for species
  • † Helichus tenuior – type locality for species
• † Heliscomys
  • † Heliscomys vetus
• † Hellwigia
  • † Hellwigia obsoleta – type locality for species
• Helophorus
  • † Helophorus auricollis
  • † Helophorus eclectus
• † Hemiacodon

• 

  † Hemiauchenia
  • † Hemiauchenia macrocephala
• † Hemiteles
  • † Hemiteles lapidescens – type locality for species
  • † Hemiteles obtectus – type locality for species
  • † Hemiteles priscus – type locality for species
  • † Hemiteles veternus – type locality for species
• † Heptacodon
• † Heptodon
  • † Heptodon calciculus
  • † Heptodon posticus
• † Heriades
  • † Heriades bowditchi – type locality for species
  • † Heriades halictinus – type locality for species
  • † Heriades laminarum – type locality for species
  • † Heriades mersatus – type locality for species
  • † Heriades mildredae – type locality for species
  • † Heriades priscus – type locality for species
  • † Heriades saxosus – type locality for species
• † Herpetotherium
  • † Herpetotherium fugax
  • † Herpetotherium innominatum
  • † Herpetotherium knighti
• Hersiliola
• † Hesperagrion
  • † Hesperagrion praevolans – type locality for species
• † Hesperhys

• 

  † Hesperocyon
  • † Hesperocyon coloradensis
  • † Hesperocyon gregarius
• † Hesperolagomys
• Heterodon
  • † Heterodon nasicus
• † Heteromyza
  • † Heteromyza detecta – type locality for species
  • † Heteromyza miocenica – type locality for species
• † Heterothops
  • † Heterothops conticens – type locality for species
• † Hexacodus
  • † Hexacodus pelodes
• † Hexerites – type locality for genus
  • † Hexerites primalis – type locality for species

• 

  † Heyderia
  • † Heyderia coloradensis – type locality for species
• † Hiatensor
  • † Hiatensor semirutus – type locality for species
• † Hipporhinops – type locality for genus
  • † Hipporhinops sternbergi – type locality for species
• † Hirmoneura – type locality for genus
  • † Hirmoneura willistoni – type locality for species
• Holbrookia
  • † Holbrookia maculata
• † Holcorpa – type locality for genus
  • † Holcorpa maculosa – type locality for species
• † Homoeogamia
  • † Homoeogamia ventriosa – type locality for species

• 

  † Homogalax
  • † Homogalax protapirinus
• † Hoplia
  • † Hoplia striatipennis – type locality for species
• † Hoplisidia – type locality for genus
  • † Hoplisidia kohliana – type locality for species
• † Hoplocampa
  • † Hoplocampa ilicis – type locality for species
• † Hoplochelys
  • † Hoplochelys crassa
• † Horistonotus
  • † Horistonotus coloradensis – type locality for species
• † Hormorus
  • † Hormorus saxorum – type locality for species
• † Humulus
  • † Humulus florissantellus

• 

  † Hyaenodon
  • † Hyaenodon crucians
  • † Hyaenodon horridus
  • † Hyaenodon mustelinus
• † Hydnobius
  • † Hydnobius tibialis – type locality for species
• Hydraena
  • † Hydraena circulata – or unidentified comparable form
• Hydrangea
  • † Hydrangea antica
  • † Hydrangea fraxinifolia
• Hydriomena – tentative report
  • † Hydriomena? protrita – type locality for species
• Hydrobius

  • 

    † Hydrobius fuscipes
  • † Hydrobius maceratus – type locality for species
  • † Hydrobius prisconatator – type locality for species
  • † Hydrobius titan – type locality for species
• † Hydromystria
  • † Hydromystria expansa
• Hydrophilus
  • † Hydrophilus extricatus – type locality for species
• Hydroporus
  • † Hydroporus sedimentorum – type locality for species
• Hydropsyche
  • † Hydropsyche marcens – type locality for species
  • † Hydropsyche operta – type locality for species
  • † Hydropsyche scudderi – type locality for species
• † Hydroptila
  • † Hydroptila phileos – type locality for species

• 

  Hygrotus
  • † Hygrotus miocenus – type locality for species
• Hylastes
  • † Hylastes americanus – type locality for species
  • † Hylastes nigrinus
• † Hylesinus – type locality for genus
  • † Hylesinus dormiscens – type locality for species
  • † Hylesinus extractus – type locality for species
  • † Hylesinus hydropicus – type locality for species
• † Hylobius
  • † Hylobius lacoei – type locality for species
• † Hylomeryx
• Hylurgops
  • † Hylurgops piger – type locality for species
• † Hymenophyllum
  • † Hymenophyllum confusum
• † Hymenorus
  • † Hymenorus haydeni – type locality for species

• 

  † Hyopsodus
  • † Hyopsodus loomisi
  • † Hyopsodus lysitensis
  • † Hyopsodus paulus
  • † Hyopsodus powellianus
  • † Hyopsodus simplex
  • † Hyopsodus walcottianus
  • † Hyopsodus wortmani
• † Hypertragulus
  • † Hypertragulus calcaratus
• † Hypisodus
  • † Hypisodus minimus
• Hypnum
  • † Hypnum coloradense
  • † Hypnum haydenii
• † Hypohippus
  • † Hypohippus osborni – type locality for species
• † Hypolagus
• † Hyporhina
  • † Hyporhina galbreathi – type locality for species
• † Hyposodus
  • † Hyposodus loomisi
• † Hyrachyus
  • † Hyrachyus modestus

• 

  † Hyracodon
  • † Hyracodon arcidens – type locality for species
  • † Hyracodon leidyanus
  • † Hyracodon nebraskensis
• † Hyracotherium
  • † Hyracotherium vasacciense
• † Hystricops

I

• † Ichneumon
  • † Ichneumon alpha – type locality for species
  • † Ichneumon concretus – type locality for species
  • † Ichneumon decrepitus – type locality for species
  • † Ichneumon dormitans – type locality for species
  • † Ichneumon exesus – type locality for species
  • † Ichneumon obduratus – type locality for species
  • † Ichneumon petrinus – type locality for species
  • † Ichneumon pollens – type locality for species
  • † Ichneumon primigenius – type locality for species
  • † Ichneumon provectus – type locality for species
  • † Ichneumon somniatus – type locality for species
  • † Ichneumon torpefactus – type locality for species
• † Ignacius
  • † Ignacius frugivorus

• 

  Ilex ^[1]
  • † Ilex artocarpidioides
  • † Ilex knightiaefolia
  • † Ilex pseudostenophylla – type locality for species. Later reclassified in the new genus Frangulops. ^[1]
• † Indusia
  • † Indusia cypridis – type locality for species
• † Iridomyrmex
  • † Iridomyrmex florissantius – type locality for species
  • † Iridomyrmex obscurans – type locality for species
• Ischnoptera
  • † Ischnoptera brunneri – type locality for species

• 

  † Ischyromys
  • † Ischyromys douglassi – or unidentified comparable form
  • † Ischyromys typus
  • † Ischyromys veterior – or unidentified comparable form
• † Isectolophus
  • † Isectolophus annectens
• † Isoetites
  • † Isoetites horridus
• † Isomira
  • † Isomira aurora – type locality for species
  • † Isomira florissantensis – type locality for species
• † Isothea – type locality for genus
  • † Isothea alleni – type locality for species
• † Isotrilophus
  • † Isotrilophus rasnitsyni – type locality for species
• † Iulus
  • † Iulus florissantellus – type locality for species

J

• † Jadera
  • † Jadera interita – type locality for species
• † Janus
  • † Janus disperditus – type locality for species
• † Jassopsis – type locality for genus
  • † Jassopsis evidens – type locality for species
• Jassus – tentative report. Lapsus calami of Iassus.
  • † "Jassus" latebrae – type locality for species
• † Judolia
  • † Judolia antecurrens – type locality for species

• 

  Juglans
  • † Juglans berryana
• Junco
  • † Junco hyemalis
• † Juncus
  • † Juncus crassulus
• † Jungermanniopsis
  • † Jungermanniopsis cockerellii
• † Jupitellia – type locality for genus
  • † Jupitellia charon – type locality for species

K

• 

  † Kalmia
  • † Kalmia elliptica
• † Kimbetohia
  • † Kimbetohia mziae – type locality for species
• † Knightomys
  • † Knightomys depressus
  • † Knightomys huerfanensis
• Koelreuteria
  • † Koelreuteria alleni
• † Kohlsimyrma – type locality for genus
  • † Kohlsimyrma gracilis – type locality for species
  • † Kohlsimyrma laticeps – type locality for species
  • † Kohlsimyrma longiceps – type locality for species
• † Kronolictus – type locality for genus
  • † Kronolictus scudderiellus – type locality for species
  • † Kronolictus vulcanus – type locality for species

L

• † Laasbium – type locality for genus
  • † Laasbium agassizii – type locality for species
  • † Laasbium sectile – type locality for species
• † Labandeiraia – type locality for genus
  • † Labandeiraia americaborealis – type locality for species
• † Labidolemur
  • † Labidolemur kayi
  • † Labidolemur serus
  • † Labidolemur soricoides – type locality for species
• † Labiduromma
  • † Labiduromma avia – type locality for species
  • † Labiduromma bormansi – type locality for species
• † Laccopygus – type locality for genus
  • † Laccopygus nilesii – type locality for species
• † Lachnopus
  • † Lachnopus humatus – type locality for species
  • † Lachnopus recuperatus – type locality for species
• † Lacon
  • † Lacon exhumatus – type locality for species

• 

  † Lagopus
  • † Lagopus leucurus
• † Lambdotherium
  • † Lambdotherium popoagicum – type locality for species
• † Lampronota
  • † Lampronota pristina – type locality for species
  • † Lampronota stygialis – type locality for species
  • † Lampronota tenebrosa – type locality for species
• † Lapton
  • † Lapton daemon – type locality for species
• Larus
• † Lasiopa
  • † Lasiopa carpenteri – type locality for species
• Lasiopodomys
  • † Lasiopodomys deceitensis
• Lasius
  • † Lasius peritulus – type locality for species
• † Lastrea
  • † Lastrea goldiana
• Lathrobium
  • † Lathrobium antediluvianum – type locality for species
• † Laurophyllum
  • † Laurophyllum caudatum
  • † Laurophyllum perseanum

• 

  Laurus
  • † Laurus socialis
• † Lebia
  • † Lebia protospiloptera – type locality for species
• † Leguminosites
  • † Leguminosites coloradensis
  • † Leguminosites lespedezoides – type locality for species
  • † Leguminosites lesquereuxiana
• † Leia
  • † Leia miocenica – type locality for species
• † Lema
  • † Lema evanescens – type locality for species
  • † Lema fortior – type locality for species
  • † Lema lesquereuxi – type locality for species
• Lemmiscus
  • † Lemmiscus curtatus
• † Lepismophlebia
  • † Lepismophlebia platymera – type locality for species

• 

  Lepisosteus
• † Leptacinus
  • † Leptacinus exsucidus – type locality for species
  • † Leptacinus fossus – type locality for species
  • † Leptacinus leidyi – type locality for species
  • † Leptacinus maclurei – type locality for species
  • † Leptacinus rigatus – type locality for species
• † Leptacodon
  • † Leptacodon tener – type locality for species
• † Leptarctus
  • † Leptarctus primus
• † Leptauchenia
  • † Leptauchenia decora
  • † Leptauchenia major
• †Leptis
  • † Leptis mystaceaeformis – type locality for species
• † Leptobatopsis
  • † Leptobatopsis ashmeadii – type locality for species
• † Leptobrochus – type locality for genus
  • † Leptobrochus luteus – type locality for species
• † Leptochoerus
  • † Leptochoerus spectabilis

• 

  † Leptocyon
  • † Leptocyon vafer
• † Leptogaster
  • † Leptogaster prior – type locality for species
• † Leptomeryx
  • † Leptomeryx esulcatus
  • † Leptomeryx evansi
  • † Leptomeryx speciosus
• † Leptomorphus
  • † Leptomorphus palaeospilus – type locality for species
• Leptophloeus
  • † Leptophloeus alternans – or unidentified comparable form
• † Leptostylus
  • † Leptostylus scudderi – type locality for species
• † Leptotomus
  • † Leptotomus parvus
• † Leptura
  • † Leptura petrorum – type locality for species
  • † Leptura ponderosissima – type locality for species
  • † Leptura wickhami – type locality for species
• Lepus

  • 

    † Lepus townsendii
• † Lestomyia
  • † Lestomyia miocenica – type locality for species
• † Leucosticte
  • † Leucosticte atrata
  • † Leucosticte tephrocotis
• † Leucozona
  • † Leucozona nigra – type locality for species
• † Libellulapis – type locality for genus
  • † Libellulapis antiquorum – type locality for species
  • † Libellulapis wilmattae – type locality for species
• † Lichnanthe
  • † Lichnanthe defuncta – type locality for species
• † Ligyrocoris
  • † Ligyrocoris exsuctus – type locality for species
• † Ligyrus
  • † Ligyrus compositus – type locality for species
  • † Ligyrus effetus – type locality for species

• 

  † Limnephilus
  • † Limnephilus eocenicus – type locality for species
• † Limnerium
  • † Limnerium consuetum – type locality for species
  • † Limnerium depositum – type locality for species
  • † Limnerium plenum – type locality for species
  • † Limnerium tectum – type locality for species
  • † Limnerium vetustum – type locality for species
• † Limnobium
  • † Limnobium obliteratum
• † Limnocema
  • † Limnocema lutescens – type locality for species
  • † Limnocema marcescens – type locality for species
  • † Limnocema mortoni – type locality for species
  • † Limnocema sternbergi – type locality for species
  • † Limnocema styx – type locality for species
• † Limnoecus
  • † Limnoecus compressus
• † Limnophila
  • † Limnophila rogersii – type locality for species
  • † Limnophila vasta – type locality for species
• † Limnophilus
  • † Limnophilus soporatus – type locality for species
• † Limnopsyche – type locality for genus
  • † Limnopsyche dispersa – type locality for species
• † Limonius
  • † Limonius aboriginalis – type locality for species
  • † Limonius florissantensis – type locality for species
  • † Limonius praecursor – type locality for species
  • † Limonius shoshonis – type locality for species
  • † Limonius volans – type locality for species
• Lindera
  • † Lindera coloradica – type locality for species
  • † Lindera obtusata
  • † Lindera varifolia – type locality for species

• 

  † Linnaea – type locality for genus
  • † Linnaea abolita – type locality for species
  • † Linnaea carcerata – type locality for species
  • † Linnaea evoluta – type locality for species
  • † Linnaea gravida – type locality for species
  • † Linnaea holmesii – type locality for species
  • † Linnaea putnami – type locality for species
• † Linyphia
  • † Linyphia byrami – type locality for species
  • † Linyphia florissanti – type locality for species
  • † Linyphia pachygnathoides – type locality for species
  • † Linyphia retensa – type locality for species
  • † Linyphia seclusa – type locality for species

• 

  † Liometopum
  • † Liometopum miocenicum – type locality for species
  • † Liometopum scudderi – type locality for species
• † Listrochelus
  • † Listrochelus puerilis – type locality for species
• † Listroderes
  • † Listroderes differens – type locality for species
  • † Listroderes evisceratus – type locality for species
• † Lithagrion
  • † Lithagrion hyalinum – type locality for species
• † Lithandrena – type locality for genus
  • † Lithandrena saxorum – type locality for species
• † Lithanthidium – type locality for genus
  • † Lithanthidium pertriste – type locality for species
• † Lithecphora – type locality for genus
  • † Lithecphora diaphana – type locality for species
  • † Lithecphora murata – type locality for species
  • † Lithecphora setigera – type locality for species
  • † Lithecphora unicolor – type locality for species
• † Lithembia
  • † Lithembia florissantensis – type locality for species
• † Litheuphaea
  • † Litheuphaea coloradensis – type locality for species
• † Lithocharis
  • † Lithocharis scottii – type locality for species
• † Lithochromus – type locality for genus
  • † Lithochromus extraneus – type locality for species
  • † Lithochromus gardneri – type locality for species
  • † Lithochromus mortuarius – type locality for species
  • † Lithochromus obstrictus – type locality for species
• † Lithocicada – type locality for genus
  • † Lithocicada perita – type locality for species
• † Lithocoris – type locality for genus
  • † Lithocoris evulsus – type locality for species
• † Lithocoryne – type locality for genus
  • † Lithocoryne arcuata – type locality for species
  • † Lithocoryne coloradensis – type locality for species
  • † Lithocoryne gravis – type locality for species

• 

  † Lithodryas – type locality for genus
  • † Lithodryas styx – type locality for species
• † Lithogryllites
  • † Lithogryllites lutzii – type locality for species
• † Litholabis
  • † Litholabis gilberti – type locality for species
• † Lithomacratria – type locality for genus
  • † Lithomacratria mirabilis – type locality for species
• † Lithomyza – type locality for genus
  • † Lithomyza condita – type locality for species
• † Lithophotina – type locality for genus
  • † Lithophotina costalis – type locality for species
  • † Lithophotina floccosa – type locality for species
• † Lithophthorus – type locality for genus
  • † Lithophthorus rugosicollis – type locality for species
• † Lithopsis
  • † Lithopsis delicata – type locality for species
  • † Lithopsis dubiosa – type locality for species
  • † Lithopsis fimbriata – or unidentified comparable form
  • † Lithopsis simillima – type locality for species
• † Lithoserix – type locality for genus
  • † Lithoserix williamsi – type locality for species
• † Lithosmylus
  • † Lithosmylus columbianus – type locality for species
• † Lithotiphia – type locality for genus
  • † Lithotiphia scudderi – type locality for species
• † Lithymnetes – type locality for genus
  • † Lithymnetes guttatus – type locality for species
• † Litobrochus – type locality for genus
  • † Litobrochus externatus – type locality for species
• † Litomylus
  • † Litomylus ishami
• † Locrites – type locality for genus
  • † Locrites copei – type locality for species
  • † Locrites whitei – type locality for species
• † Locusta
  • † Locusta silens – type locality for species
• Lomatia
• † Lomatites
  • † Lomatites spinosa
• Longitarsus
• Lontra

  • 

    † Lontra canadensis – or unidentified comparable form
• † Lophiparamys
  • † Lophiparamys debequensis
• Lordithon
  • † Lordithon durabilis – type locality for species
  • † Lordithon funditus – type locality for species
  • † Lordithon longiceps
  • † Lordithon lyelli – type locality for species
  • † Lordithon stygis – type locality for species
• † Loveina
  • † Loveina zephyri
• † Lowesaurus
  • † Lowesaurus matthewi – type locality for species
• † Loxolophus
  • † Loxolophus hyattianus
• † Lucanus
  • † Lucanus fossilis – type locality for species
• † Lucidota
  • † Lucidota prima – type locality for species
• † Ludiophanes – type locality for genus
  • † Ludiophanes haydeni – type locality for species
• † Ludius
  • † Ludius exanimatus – type locality for species
  • † Ludius granulicollis – type locality for species
  • † Ludius heeri – type locality for species
  • † Ludius laevissimus – type locality for species
  • † Ludius primitivus – type locality for species
  • † Ludius propheticus – type locality for species
  • † Ludius restructus – type locality for species
  • † Ludius submersus – type locality for species
• † Luperodes
  • † Luperodes submonilis – type locality for species
• † Lutrochites – type locality for genus
  • † Lutrochites lecontei – type locality for species

• 

  † Lycosa
  • † Lycosa florissanti – type locality for species
• † Lygaeus
  • † Lygaeus faeculentus – type locality for species
  • † Lygaeus obsolescens – type locality for species
  • † Lygaeus stabilitus – type locality for species
• Lygodium
  • † Lygodium coloradense
  • † Lygodium kaulfussi
• Lynx
  • † Lynx rufus
• Lytta
  • † Lytta lithophila – type locality for species

M

• † Macratria
  • † Macratria gigantea – type locality for species

• 

  Macrocranion
  • † Macrocranion nitens
• † Macrodactylus
  • † Macrodactylus pluto – type locality for species
  • † Macrodactylus propheticus – type locality for species
• † Macrophya
  • † Macrophya pervetusta – type locality for species
• † Macrorhoptus
  • † Macrorhoptus intutus – type locality for species
• Magdalis
  • † Magdalis lecontei
  • † Magdalis sedimentorum – type locality for species

• 

  Magnolia
  • † Magnolia berryi
  • † Magnolia magnifolia
  • † Magnolia regalis
  • † Magnolia rotundifolia
• Mahonia
  • † Mahonia marginata
  • † Mahonia obliqua – type locality for species
  • † Mahonia subdenticulata
• † Maiorana
• † Malachius
  • † Malachius immurus – type locality for species
• † Malus
  • † Malus florissantensis
  • † Malus pseudocredneria
• † Mammuthus

  • 

    † Mammuthus columbi
• † Manapsis – type locality for genus
  • † Manapsis anomala – type locality for species
• Marmota
  • † Marmota flaviventris
• † Marquettia
  • † Marquettia americana – type locality for species
• Marsilea ^[3]
  • † Marsilea sprungerorum ^[3]
• Martes
• † Masteutes
  • † Masteutes rupis – type locality for species
  • † Masteutes saxifer – type locality for species
• † Mataeoschistus – type locality for genus
  • † Mataeoschistus limigenus – type locality for species
• † Matthewlabis
  • † Matthewlabis cedrensis
• † Mattimys
• † Mecistoneuron – type locality for genus
  • † Mecistoneuron perpetuum – type locality for species
• Mecocephala

• 

  † Megacerops
  • † Megacerops kuwagatarhinus
• Megachile
  • † Megachile praedicta – type locality for species
• † Megacyllene
  • † Megacyllene florissantensis – type locality for species
• † Megadelphus
  • † Megadelphus lundeliusi
• † Megahippus
• † Megalagus
  • † Megalagus brachydon
  • † Megalagus brachyodon
  • † Megalagus turgidus
• † Megalesthonyx
• † Megalictis
• † Megapenthes
  • † Megapenthes primaevus – type locality for species
• † Megaraphidia – type locality for genus
  • † Megaraphidia elegans – type locality for species
  • † Megaraphidia exhumata – type locality for species
• † Megatryphon – type locality for genus
  • † Megatryphon mortiferus – type locality for species
• † Megatylopus
  • † Megatylopus gigas – or unidentified comparable form
• † Megaxyela
  • † Megaxyela petrefacta – type locality for species
• † Melanactes
  • † Melanactes cockerelli – type locality for species
• † Melanagrion
  • † Melanagrion nigerrimum – type locality for species
  • † Melanagrion umbratum – type locality for species
• † Melanagromyza
  • † Melanagromyza prisca – type locality for species
  • † Melanagromyza tephrias – type locality for species
• † Melanderella
  • † Melanderella glossalis – type locality for species
• † Melanophila
  • † Melanophila cockerellae – type locality for species
  • † Melanophila handlirschi – type locality for species
  • † Melanophila heeri – type locality for species
• Melanthrips
  • † Melanthrips extincta – type locality for species
• † Melieria
  • † Melieria atavina – type locality for species
  • † Melieria calligrapha – type locality for species
• † Melittomma
  • † Melittomma lacustrinum – type locality for species
• † Mellinus
  • † Mellinus handlirschi – type locality for species
• Melospiza
  • † Melospiza lincolnii
• † Meniscotherium
  • † Meniscotherium chamense
  • † Meniscotherium tapiacitum

• 

  † Menoceras
  • † Menoceras barbouri
• Mephitis
  • † Mephitis mephitis
• † Meracantha
  • † Meracantha lacustris – type locality for species
• † Merychippus
  • † Merychippus coloradense
  • † Merychippus sejunctus
• † Merychyus
  • † Merychyus arenarum
  • † Merychyus elegans – type locality for species
• † Merycochoerus
  • † Merycochoerus magnus
  • † Merycochoerus matthewi
• † Merycodus
  • † Merycodus warreni
• † Merycoidodon – type locality for genus
  • † Merycoidodon culbertsoni – type locality for species
  • † Merycoidodon major
• † Mesatirhinus
  • † Mesatirhinus junius
• † Mesobrochus – type locality for genus
  • † Mesobrochus imbecillus – type locality for species
  • † Mesobrochus lethaeus – type locality for species
• † Mesochorus
  • † Mesochorus abolitus – type locality for species
  • † Mesochorus aboriginalis – type locality for species
  • † Mesochorus carceratus – type locality for species
  • † Mesochorus cataclysmi – type locality for species
  • † Mesochorus dormitorius – type locality for species
  • † Mesochorus lapideus – type locality for species
  • † Mesochorus revocatus – type locality for species
  • † Mesochorus terrosus – type locality for species

• 

  † Mesocyon
  • † Mesocyon temnodon
• † Mesodma
  • † Mesodma ambigua
  • † Mesodma hensleighi
• † Mesogaulus
  • † Mesogaulus paniensis
• † Mesohippus
  • † Mesohippus bairdi
• † Mesoleptus
  • † Mesoleptus apertus – type locality for species
  • † Mesoleptus exstirpatus – type locality for species
• † Mesoneura
  • † Mesoneura vexabilis – type locality for species

• 

  † Mesonyx
  • † Mesonyx obtusidens
• † Mesopimpla – type locality for genus
  • † Mesopimpla sequoiarum – type locality for species
• † Mesostenus
  • † Mesostenus modestus – type locality for species
• Messor
  • † Messor sculpturatus – type locality for species
• † Metacheiromys
• Metachroma
  • † Metachroma florissantensis – type locality for species
• † Metarhinus
• Metasequoia
  • † Metasequoia occidentalis
• † Metechinus
  • † Metechinus amplior
• † Metoecus
  • † Metoecus geikiei – type locality for species
• † Metrobates
  • † Metrobates aeternalis – type locality for species

• 

  † Miacis
  • † Miacis edax
  • † Miacis exiguus
  • † Miacis latidens
  • † Miacis parvivorus
  • † Miacis vorax
• Miagrammopes
• † Mianeuretus – type locality for genus
  • † Mianeuretus eocenicus – type locality for species
  • † Mianeuretus mirabilis – type locality for species
• † Michenia
• † Microgaster
  • † Microgaster primordialis – type locality for species
• † Microplitis
  • † Microplitis vesperus – type locality for species
• † Microrhagus
  • † Microrhagus fossilis – type locality for species
  • † Microrhagus miocenicus – type locality for species
  • † Microrhagus vulcanicus – type locality for species
• † Microstylum
  • † Microstylum destructum – type locality for species
  • † Microstylum wheeleri – type locality for species
• † Microsyops
  • † Microsyops angustidens
  • † Microsyops annectens
  • † Microsyops elegans
  • † Microsyops knightensis
  • † Microsyops latidens
  • † Microsyops scottianus
• † Microtomarctus
  • † Microtomarctus conferta
• Microtus

  • 

    † Microtus californicus – or unidentified comparable form
  • † Microtus longicaudus
  • † Microtus meadensis
  • † Microtus ochrogaster
  • † Microtus paroperarius
• Mictomys
  • † Mictomys meltoni
  • † Mictomys vetus
• † Mimomys
  • † Mimomys virginianus
• † Mimoperadectes
  • † Mimoperadectes labrus
• † Mimosites
  • † Mimosites coloradensis
• † Mimotricentes
  • † Mimotricentes ischyrus – type locality for species
• † Mindarus – type locality for genus
  • † Mindarus recurvus – type locality for species
  • † Mindarus scudderi – type locality for species

• 

  † Miniochoerus
  • † Miniochoerus gracilis
• † Miocaenia – type locality for genus
  • † Miocaenia pectinicornis – type locality for species
• † Miocitta – type locality for genus
  • † Miocitta galbreathi – type locality for species
• † Miocoris – type locality for genus
  • † Miocoris fagi – type locality for species
• † Miocyphon – type locality for genus
  • † Miocyphon punctulatus – type locality for species
• † Miodytiscus – type locality for genus
  • † Miodytiscus hirtipes – type locality for species
• † Miogeraeus – type locality for genus
  • † Miogeraeus recurrens – type locality for species

• 

  † Miohippus
  • † Miohippus obliquidens
• † Miolabis
  • † Miolabis longiceps
• † Miolachnosterna – type locality for genus
  • † Miolachnosterna tristoides – type locality for species
• † Miolithocharis – type locality for genus
  • † Miolithocharis lithographica – type locality for species
• † Miomyrmex
  • † Miomyrmex impactus – type locality for species
  • † Miomyrmex striatus – type locality for species
• † Miophenolia – type locality for genus
  • † Miophenolia cilipes – type locality for species
• † Miopodagrion
  • † Miopodagrion optimum – type locality for species
• † Miosilpha – type locality for genus
  • † Miosilpha necrophiloides – type locality for species
• † Miospermophilus
  • † Miospermophilus bryanti
• † Miostenosis – type locality for genus
  • † Miostenosis lacordairei – type locality for species

• 

  † Miracinonyx
  • † Miracinonyx inexpectatus – or unidentified comparable form
  • † Miracinonyx studeri
• † Mischoserphus
  • † Mischoserphus bruesi – type locality for species
• † Mitostylus
  • † Mitostylus abacus – type locality for species
  • † Mitostylus obdurefactus – type locality for species
• † Monocrepidius
  • † Monocrepidius dubiosus – type locality for species
• † Monophlebus
  • † Monophlebus simplex – type locality for species
• † Monosaulax
  • † Monosaulax curtus
• Mordella
  • † Mordella atrata – or unidentified comparable form
  • † Mordella lapidicola – type locality for species
  • † Mordella priscula – type locality for species
  • † Mordella stygia – type locality for species
• Mordellistena
  • † Mordellistena florissantensis – type locality for species
  • † Mordellistena nearctica – type locality for species
  • † Mordellistena protogaea – type locality for species
  • † Mordellistena scudderiana – type locality for species
  • † Mordellistena smithiana – type locality for species
• † Moropus
  • † Moropus elatus – or unidentified comparable form
• Morus
  • † Morus symmetrica
• † Moyamyia – type locality for genus
  • † Moyamyia limigena – type locality for species
• Musca
  • † Musca vinculata – type locality for species
• Mustela
  • † Mustela richardsonii
  • † Mustela nigripes
• † Myas
  • † Myas rigefactus – type locality for species
  • † Myas umbrarum – type locality for species
• † Mycetaulus
  • † Mycetaulus incretus – type locality for species
• † Mycetophagus
  • † Mycetophagus exterminatus – type locality for species
  • † Mycetophagus willistoni – type locality for species
• † Mycetophila
  • † Mycetophila bradenae – type locality for species
  • † Mycetophila occultata – type locality for species
• Mycetoporus
  • † Mycetoporus demersus – type locality for species
• † Mycomya
  • † Mycomya cockerelli – type locality for species
  • † Mycomya lithomendax – type locality for species
• † Mydas
  • † Mydas miocenicus – type locality for species

• 

  Myrica
  • † Myrica drymeja
• † Myrmecites – type locality for genus
  • † Myrmecites rotundiceps – type locality for species
• Myrmica
  • † Myrmica lobifrons
• † Myrtophyllum
  • † Myrtophyllum torreyi
• † Mystipterus
  • † Mystipterus martini
• † Mytonomys
  • † Mytonomys coloradensis

N

• † Najadopsis
  • † Najadopsis rugulosa
• † Nannodectes
  • † Nannodectes gazini
  • † Nannodectes gidleyi
  • † Nannodectes simpsoni
• † Nanodelphys
  • † Nanodelphys hunti
• † Nanthacia
  • † Nanthacia torpida – type locality for species
• † Navajovius
  • † Navajovius kohlhaasae – type locality for species

• 

  Nebria
  • † Nebria occlusa – type locality for species
• † Nebritus
  • † Nebritus willistoni – type locality for species
• † Necrobia
  • † Necrobia divinatoria – type locality for species
  • † Necrobia sibylla – type locality for species
• † Necrochromus – type locality for genus
  • † Necrochromus cockerelli – type locality for species
  • † Necrochromus labatus – type locality for species
  • † Necrochromus saxificus – type locality for species
• † Necrocydnus – type locality for genus
  • † Necrocydnus amyzonus – type locality for species
  • † Necrocydnus revectus – type locality for species
  • † Necrocydnus senior – type locality for species
  • † Necrocydnus solidatus – type locality for species
  • † Necrocydnus stygius – type locality for species
  • † Necrocydnus torpens – type locality for species
  • † Necrocydnus vulcanius – type locality for species
• † Necrodes
  • † Necrodes primaevus – type locality for species
• † Necropsylla – type locality for genus
  • † Necropsylla rigida – type locality for species
  • † Necropsylla rigidula – type locality for species
• † Nelumbium
  • † Nelumbium tenuifolium
• † Nemognatha
  • † Nemognatha exsecta – type locality for species
• Neohypnus
• Neogale
  • † Neogale frenata
  • † Neogale vison
• † Neoliotomus
  • † Neoliotomus conventus
  • † Neoliotomus ultimus
• Neoptochus – tentative report
• † Neorhynchocephalus
  • † Neorhynchocephalus melanderi – type locality for species
  • † Neorhynchocephalus occultator – type locality for species
  • † Neorhynchocephalus vulcanicus – type locality for species
• Neotoma
  • † Neotoma cinerea
  • † Neotoma ozarkensis
• † Nepa
  • † Nepa vulcanica – type locality for species

• 

  † Nephila
  • † Nephila pennatipes – type locality for species
• † Netelia
  • † Netelia memorialis – type locality for species
• † Neurodromicus – type locality for genus
  • † Neurodromicus dorsalis – type locality for species
• † Nicocles
  • † Nicocles miocenicus – type locality for species
• † Niptomomys
  • † Niptomomys doreenae – type locality for species
• Nitidotachinus
  • † Nitidotachinus lanei
• Nitidula
  • † Nitidula prior – type locality for species
• † Nordenskioldia
  • † Nordenskioldia borealis
• † Nortonella – type locality for genus
  • † Nortonella typica – type locality for species
• † Nosotetocus – type locality for genus
  • † Nosotetocus debilis – type locality for species
  • † Nosotetocus marcovi – type locality for species
  • † Nosotetocus vespertinus – type locality for species

• 

  † Notharctus
  • † Notharctus robinsoni
  • † Notharctus robustior
• † Nothopus
  • † Nothopus kingii – type locality for species
• † Nothoserphus
  • † Nothoserphus rasnitsyni – type locality for species
• Notonecta
  • † Notonecta binuda – type locality for species
  • † Notonecta emersoni – type locality for species
• † Notoparamys
  • † Notoparamys arctios – type locality for species
  • † Notoparamys costilloi
• Numenius
  • † Numenius madagascariensis
• † Numitor – type locality for genus
  • † Numitor claviger – type locality for species
• † Nyctea
  • † Nyctea scandiaca
• † Nyctitherium
  • † Nyctitherium velox – or unidentified comparable form
• † Nyktalos – type locality for genus
  • † Nyktalos uhleri – type locality for species
  • † Nyktalos vigil – type locality for species

• 

  Nymphaea
  • † Nymphaea leei
  • † Nymphaea pulchella
• † Nymphalites – type locality for genus
  • † Nymphalites obscurus – type locality for species
  • † Nymphalites scudderi – type locality for species
• Nysius
  • † Nysius stratus – type locality for species
  • † Nysius terrae – type locality for species
  • † Nysius tritus – type locality for species
  • † Nysius vecula – type locality for species
  • † Nysius vinctus – type locality for species
• † Nyssa
  • † Nyssa alata
  • † Nyssa obovata

O

• Ochotona
  • † Ochotona princeps
• † Ocymoromelitta – type locality for genus
  • † Ocymoromelitta florissantella – type locality for species
  • † Ocymoromelitta miocenica – type locality for species
  • † Ocymoromelitta sorella – type locality for species
• † Odaxosaurus – or unidentified comparable form
  • † Odaxosaurus piger
• Odocoileus

  • 

    † Odocoileus hemionus
• † Odynerus
  • † Odynerus palaeophilus – type locality for species
  • † Odynerus percontusus – type locality for species
  • † Odynerus praesepultus – type locality for species
  • † Odynerus terryi – type locality for species
  • † Odynerus wilmattae – type locality for species
• † Oedipoda
  • † Oedipoda praefocata – type locality for species
• † Ogygoptynx – type locality for genus
  • † Ogygoptynx wetmorei – type locality for species
• † Olbiogaster
  • † Olbiogaster simplex – type locality for species
• † Oligaeschna
  • † Oligaeschna lapidaria – type locality for species
  • † Oligaeschna separata – type locality for species
• † Oligoaeschna – type locality for genus
  • † Oligoaeschna needhami – type locality for species
• † Oligobruchus
  • † Oligobruchus florissantensis – type locality for species
  • † Oligobruchus haywardi – type locality for species
  • † Oligobruchus primoticus – type locality for species
  • † Oligobruchus scudderi – type locality for species
  • † Oligobruchus submersus – type locality for species
  • † Oligobruchus wilsoni – type locality for species
• † Oligocryptus – type locality for genus
  • † Oligocryptus sectus – type locality for species
• † Oligodonta – type locality for genus
  • † Oligodonta florissantensis – type locality for species

• 

  † Oligomerus
  • † Oligomerus breviusculus – type locality for species
  • † Oligomerus duratus – type locality for species
  • † Oligomerus florissantensis – type locality for species
• † Oligomyotis
  • † Oligomyotis casementi
• † Oligoneuroides – type locality for genus
  • † Oligoneuroides destructus – type locality for species
• † Oligoryctes
• † Oligoscalops
  • † Oligoscalops galbreathi
• † Oligotricha
  • † Oligotricha evanescens – type locality for species
• † Ologlyptus
  • † Ologlyptus primus – type locality for species
• Olophrum
  • † Olophrum boreale
  • † Olophrum obtectum
• Omalium
  • † Omalium antiquorum – type locality for species
• † Omileus
  • † Omileus evanidus – type locality for species
• † Omomys
  • † Omomys carteri
• Omus
  • † Omus audouini

• 

  Ondatra
  • † Ondatra annectens
• † Oodectes
  • † Oodectes herpestoides
• Ophisaurus
• Ophryastes
  • † Ophryastes championi
  • † Ophryastes grandis – type locality for species
  • † Ophryastes petrarum
• † Ophryastites
  • † Ophryastites absconsus – type locality for species
  • † Ophryastites cinereus – type locality for species
  • † Ophryastites dispertitus – type locality for species
  • † Ophryastites hendersoni – type locality for species
  • † Ophryastites miocenus – type locality for species
• † Ophyra
  • † Ophyra vetusta – type locality for species
• † Opisthotriton
  • † Opisthotriton kayi – or unidentified comparable form
• † Orchelimum
  • † Orchelimum placidum – type locality for species
• Orchestes
  • † Orchestes languidulus – type locality for species
• Oreamnos – or unidentified comparable form

  • 

    † Oreamnos harringtoni
• † Oreolagus
  • † Oreolagus wilsoni – type locality for species
• † Oreopanax
  • † Oreopanax dissecta
  • † Oreopanax elongatum – type locality for species
• † Oreotalpa – type locality for genus
  • † Oreotalpa florissantensis – type locality for species
• † Ormyrodes
  • † Ormyrodes petrefactus – type locality for species
• † Orohippus
  • † Orohippus sylvaticus
• † Oromeryx

• 

  † Orontium
  • † Orontium fossile
• † Orphilus
  • † Orphilus dubius
• † Orthocentrus
  • † Orthocentrus defossus – type locality for species
  • † Orthocentrus primus – type locality for species
• † Orthriocorisa – type locality for genus
  • † Orthriocorisa longipes – type locality for species
• † Oryctogma – type locality for genus
  • † Oryctogma sackenii – type locality for species
• † Oryctorhinus – type locality for genus
  • † Oryctorhinus tenuirostris – type locality for species
• † Oryctoscirtetes – type locality for genus
  • † Oryctoscirtetes protogaeum – type locality for species
• † Osmanthus
  • † Osmanthus praemissa

• 

  † Osmunda
  • † Osmunda greenlandica
• † Osmylidia
  • † Osmylidia requieta – type locality for species
• † Otiorhynchites
  • † Otiorhynchites absentivus – type locality for species
  • † Otiorhynchites commutatus – type locality for species
  • † Otiorhynchites florissantensis – type locality for species
  • † Otiorhynchites tysoni
• † Otiorhynchus
  • † Otiorhynchus flaccus – type locality for species
  • † Otiorhynchus subteractus – type locality for species
• Ovis
  • † Ovis canadensis
• † Oxyacodon
  • † Oxyacodon archibaldi – type locality for species

• 

  † Oxyaena
  • † Oxyaena forcipata
  • † Oxyaena gulo
  • † Oxyaena intermedia
  • † Oxyaena lupina – or unidentified comparable form
  • † Oxyaena pardalis – or unidentified comparable form
• † Oxycera
  • † Oxycera contusa – type locality for species
• † Oxyclaenus
  • † Oxyclaenus cuspidatus – or unidentified comparable form
  • † Oxyclaenus subbituminus – type locality for species
• † Oxygonus
  • † Oxygonus primus – type locality for species
• † Oxyomus
  • † Oxyomus nearcticus – type locality for species
• † Oxyprimus
  • † Oxyprimus galadrielae – or unidentified comparable form
• † Oxyserphus
  • † Oxyserphus exhumatus – type locality for species
• Oxytelus
  • † Oxytelus laqueatus
  • † Oxytelus pristinus – type locality for species
  • † Oxytelus subapterus – type locality for species

P

• 

  † Pachyaena
  • † Pachyaena ossifraga – tentative report
• † Pachybaris
  • † Pachybaris rudis – type locality for species
• † Pachylobius
  • † Pachylobius compressus
  • † Pachylobius depraedatus – type locality for species
• † Pachysomites – type locality for genus
  • † Pachysomites inermis – type locality for species
• † Pachysystropus – type locality for genus
  • † Pachysystropus condemnatus – type locality for species
  • † Pachysystropus rohweri – type locality for species
• † Pactopus
  • † Pactopus americanus – type locality for species

• 

  † Paederus
  • † Paederus adumbratus – type locality for species
• † Paladicella – type locality for genus
  • † Paladicella eruptionis – type locality for species
• † Palaeictops
  • † Palaeictops bicuspis
  • † Palaeictops multicuspis
• † Palaeobittacus – type locality for genus
  • † Palaeobittacus eocenicus – type locality for species
• † Palaeochrysa – type locality for genus
  • † Palaeochrysa concinnula – type locality for species
  • † Palaeochrysa stricta – type locality for species
  • † Palaeochrysa wickhami – type locality for species
• † Palaeocrex – type locality for genus
  • † Palaeocrex fax – type locality for species
• † Palaeodrassus
  • † Palaeodrassus cockerelli – type locality for species
  • † Palaeodrassus florissanti – type locality for species
  • † Palaeodrassus hesternus
  • † Palaeodrassus interitus – type locality for species

• 

  † Palaeogale
  • † Palaeogale sectoria
• † Palaeogyps – type locality for genus
  • † Palaeogyps prodromus – type locality for species
• † Palaeolagus
  • † Palaeolagus burkei – type locality for species
  • † Palaeolagus haydeni
  • † Palaeolagus intermedius
• † Palaeometa
  • † Palaeometa opertanea – type locality for species
• † Palaeonanophyes – type locality for genus
  • † Palaeonanophyes zherikhini – type locality for species

• 

  † Palaeonictis
  • † Palaeonictis occidentalis
• † Palaeopachygnatha – type locality for genus
  • † Palaeopachygnatha cockerelli – type locality for species
  • † Palaeopachygnatha scudderi – type locality for species
• † Palaeopherocera
  • † Palaeopherocera scudderi – type locality for species
• † Palaeoplatyura
  • † Palaeoplatyura eocenica – type locality for species
• † Palaeopotamogeton
  • † Palaeopotamogeton florissanti
• † Palaeorehnia – type locality for genus
  • † Palaeorehnia maculata – type locality for species
• † Palaeoscincosaurus – type locality for genus
  • † Palaeoscincosaurus middletoni – type locality for species
• † Palaeosinopa
  • † Palaeosinopa incerta
• † Palaeosmodicum – type locality for genus
  • † Palaeosmodicum hamiltoni – type locality for species
• † Palaeospiza
  • † Palaeospiza bella

• 

  † Palaeosyops – type locality for genus
  • † Palaeosyops fontinalis – type locality for species
• † Palaeotaxonus – type locality for genus
  • † Palaeotaxonus trivittatus – type locality for species
  • † Palaeotaxonus typicus – type locality for species
  • † Palaeotaxonus vetus – type locality for species
• † Palaeoteleia – type locality for genus
  • † Palaeoteleia oxyura – type locality for species
• † Palaeotorymus
  • † Palaeotorymus aciculatus – type locality for species
  • † Palaeotorymus laevis – type locality for species
  • † Palaeotorymus striatus – type locality for species
  • † Palaeotorymus typicus – type locality for species
• † Palaeovelia – type locality for genus
  • † Palaeovelia spinosa – type locality for species

• 

  † Palaeovespa – type locality for genus
  • † Palaeovespa florissantia – type locality for species
  • † Palaeovespa gillettei – type locality for species
  • † Palaeovespa relecta – type locality for species
  • † Palaeovespa scudderi – type locality for species
  • † Palaeovespa wilsoni – type locality for species
• † Palaphrodes – type locality for genus
  • † Palaphrodes cincta – type locality for species
  • † Palaphrodes irregularis – type locality for species
  • † Palaphrodes obliqua – type locality for species
  • † Palaphrodes obscura – type locality for species
  • † Palaphrodes transversa – type locality for species
• † Palatobaena
  • † Palatobaena bairdi
• † Palecphora – type locality for genus
  • † Palecphora communis – type locality for species
  • † Palecphora inornata – type locality for species
  • † Palecphora maculata – type locality for species
  • † Palecphora marvinei – type locality for species
  • † Palecphora praevalens – type locality for species
• † Paleocarcinophora
  • † Paleocarcinophora lithophila – type locality for species
• † Paleoclinolabus
  • † Paleoclinolabus dormitus – type locality for species
• † Palmites
• † Palmocarpon
  • † Palmocarpon commune
  • † Palmocarpon compositum
  • † Palmocarpon lineatum
  • † Palmocarpon subcylindricum
  • † Palmocarpon truncatum
• † Paloedemera – type locality for genus
  • † Paloedemera crassipes – type locality for species
• † Paloreodoxites
  • † Paloreodoxites plicatus
• † Paltorhynchus
  • † Paltorhynchus bisulcatus – type locality for species
  • † Paltorhynchus depratus
  • † Paltorhynchus narwhal
  • † Paltorhynchus rectirostris – type locality for species
  • † Paltorhynchus sedatus – type locality for species
• † Panax
  • † Panax andrewsii
• † Pandeleteinus
  • † Pandeleteinus nudus – type locality for species

• 

  † Panorpa
  • † Panorpa arctiiformis – type locality for species
  • † Panorpa rigida – type locality for species
• † Pantoclis
  • † Pantoclis deperdita – type locality for species
• † Pantolestes
  • † Pantolestes natans
• † Paracarpinus
  • † Paracarpinus fraterna
• Paracosmus – type locality for genus
  • † Paracosmus antiquus – type locality for species
  • † Paracosmus coquilletti – type locality for species
  • † Paracosmus palpalis – type locality for species
  • † Paracosmus recurrens – type locality for species
• † Paracosoryx
• † Paracynarctus
  • † Paracynarctus kelloggi
• † Paradjidaumo
  • † Paradjidaumo trilophus
• † Paraglyptosaurus
  • † Paraglyptosaurus princeps – type locality for species
• † Parahippus
  • † Parahippus leonensis – or unidentified comparable form
  • † Parahippus pawniensis – type locality for species
• † Parajulus
  • † Parajulus cockerelli – type locality for species

• 

  † Paramylodon
  • † Paramylodon harlani
• † Paramys
  • † Paramys copei
  • † Paramys excavatus
  • † Paramys relictus
  • † Paramys taurus
• † Parandra
  • † Parandra florissantensis – type locality for species
• † Parattus – type locality for genus
  • † Parattus evocatus – type locality for species
  • † Parattus latitatus – type locality for species
  • † Parattus oculatus – type locality for species
  • † Parattus resurrectus – type locality for species

• 

  † Paratylopus
  • † Paratylopus labiatus
• † Parectypodus
  • † Parectypodus lunatus
• † Parictis
  • † Parictis dakotensis
• † Parodarmistus – type locality for genus
  • † Parodarmistus abscissus – type locality for species
  • † Parodarmistus caducus – type locality for species
  • † Parodarmistus collisus – type locality for species
  • † Parodarmistus defectus – type locality for species
  • † Parodarmistus exanimatus – type locality for species
  • † Parodarmistus inhibitus – type locality for species
• † Parolamia – type locality for genus
  • † Parolamia rudis – type locality for species
• † Parophisaurus – type locality for genus
  • † Parophisaurus pawneensis – type locality for species
• † Parotermes – type locality for genus
  • † Parotermes insignis – type locality for species
• † Parthenocissus
  • † Parthenocissus osbornii
• † Parvericius
  • † Parvericius montanus
• † Passaloecus
  • † Passaloecus fasciatus – type locality for species
  • † Passaloecus scudderi – type locality for species

• 

  † Patriofelis
  • † Patriofelis ulta
• † Paussopsis – type locality for genus
  • † Paussopsis nearctica – type locality for species
  • † Paussopsis secunda – type locality for species
• Pediacus
  • † Pediacus periclitans – type locality for species
• Pekania
  • † Pekania diluviana
• † Pelandrena – type locality for genus
  • † Pelandrena reducta – type locality for species
• † Pellea
  • † Pellea antiquella
• † Peltis
  • † Peltis laminata – type locality for species

• 

  † Peltosaurus
  • † Peltosaurus granulosus – type locality for species
• † Pelycodus
  • † Pelycodus danielsae
  • † Pelycodus jarrovii
• † Pelycomys
  • † Pelycomys placidus
  • † Pelycomys rugosus
• † Penetrigonias
  • † Penetrigonias dakotensis
• † Penosphyllum
  • † Penosphyllum cordatum
• † Pentatomites – type locality for genus
  • † Pentatomites foliarum – type locality for species

• 

  Penthetria – type locality for genus
  • † Penthetria creedensis – type locality for species
  • † Penthetria immutabilis – type locality for species
  • † Penthetria intermedia – type locality for species
  • † Penthetria longifurca – type locality for species
• † Pepsis
  • † Pepsis avitula – type locality for species
• † Peraceras
  • † Peraceras profectum
  • † Peraceras superciliosum
• † Peradectes
  • † Peradectes elegans – type locality for species
  • † Peradectes protinnominatus – type locality for species

• 

  † Peratherium
  • † Peratherium comstocki – or unidentified comparable form
• † Perchoerus
  • † Perchoerus nanus
• † Periptychus
  • † Periptychus coarctatus
• Peromyscus
  • † Peromyscus cragini
  • † Peromyscus maniculatus
  • † Peromyscus progressus
• Persea
  • † Persea brossiana
  • † Persea florissantia – type locality for species

• 

  † Petraeomyrmex – type locality for genus
  • † Petraeomyrmex minimus – type locality for species
• † Petrolabis
  • † Petrolabis gurneyi – type locality for species
• † Petrolestes – type locality for genus
  • † Petrolestes hendersoni – type locality for species
• † Petrolystra – type locality for genus
  • † Petrolystra gigantea – type locality for species
  • † Petrolystra heros – type locality for species
• † Petrunkevitchiana
  • † Petrunkevitchiana oculata – type locality for species
• † Phaca
  • † Phaca wilmattae
• Phalacrocorax
  • † Phalacrocorax mediterraneus
• Phalaropus
  • † Phalaropus lobatus
• † Phaseolites
  • † Phaseolites dedal – type locality for species
• † Phasmagyps – type locality for genus
  • † Phasmagyps patritus – type locality for species
• Pheidole
  • † Pheidole tertiaria – type locality for species
• † Phenacodaptes
  • † Phenacodaptes sabulosus

• 

  † Phenacodus
  • † Phenacodus grangeri
  • † Phenacodus intermedius
  • † Phenacodus magnus
  • † Phenacodus vortmani
• † Phenacolestes – type locality for genus
  • † Phenacolestes mirandus – type locality for species
  • † Phenacolestes parallelus – type locality for species
• Phenacomys
  • † Phenacomys deeringensis
  • † Phenacomys gryci – or unidentified comparable form
  • † Phenacomys intermedius
• † Phenacoperga
  • † Phenacoperga coloradensis – type locality for species
• † Phenacopsyche – type locality for genus
  • † Phenacopsyche larvalis – type locality for species
  • † Phenacopsyche vexans – type locality for species
• † Phenanthera
  • † Phenanthera petalifera

• 

  Philadelphus
  • † Philadelphus minutus – type locality for species
• † Philanthus
  • † Philanthus saxigenus – type locality for species
• Philhydrus
  • † Philhydrus scudderi
• † Philonicus
  • † Philonicus saxorum – type locality for species
• Philonthus
  • † Philonthus abavus
  • † Philonthus horni – type locality for species
  • † Philonthus invelatus – type locality for species
  • † Philonthus marcidulus – type locality for species
• † Philoponites
  • † Philoponites praefractus – type locality for species
• † Philorites – type locality for genus
  • † Philorites johannseni – type locality for species
  • † Philorites pallescens – type locality for species

• 

  † Phlaocyon
  • † Phlaocyon leucosteus – type locality for species
• † Phloeonemites – type locality for genus
  • † Phloeonemites miocenus – type locality for species
• Phloeosinus
  • † Phloeosinus scopulorum
• Phloeotribus
  • † Phloeotribus zimmermanni – type locality for species
• † Phora
  • † Phora tumbae – type locality for species
• † Phrudopamera – type locality for genus
  • † Phrudopamera chittendeni – type locality for species
  • † Phrudopamera wilsoni – type locality for species
• Phryganea
  • † Phryganea labefacta – type locality for species
  • † Phryganea miocenica – type locality for species
  • † Phryganea wickhami – type locality for species

• 

  Phrynosoma
  • † Phrynosoma douglassi
• † Phthinocoris – type locality for genus
  • † Phthinocoris colligatus – type locality for species
  • † Phthinocoris languidus – type locality for species
  • † Phthinocoris lethargicus – type locality for species
  • † Phthinocoris petraeus – type locality for species
• † Phylledestes – type locality for genus
  • † Phylledestes vorax – type locality for species
• † Phyllites
  • † Phyllites pagosensis
• † Phyllobaenus
  • † Phyllobaenus wolcotti – type locality for species
• Phyllobius
  • † Phyllobius antecessor – type locality for species

• 

  † Phyllophaga
  • † Phyllophaga avus
  • † Phyllophaga disrupta – type locality for species
  • † Phyllophaga extincta – type locality for species
• † Phymatodes
  • † Phymatodes grandaevus – type locality for species
  • † Phymatodes miocenicus – type locality for species
  • † Phymatodes volans – type locality for species
• Pica
  • † Pica hudsonia
• Picea
  • † Picea lahontense
  • † Picea magna – type locality for species
  • † Picea pinifructus
• Picoides
  • † Picoides villosus
• † Pidonia
  • † Pidonia ingenua – type locality for species
  • † Pidonia leidyi – type locality for species
• † Piesma – tentative report
  • † Piesma rotunda – type locality for species
• † Piezocoris – type locality for genus
  • † Piezocoris compactilis – type locality for species
  • † Piezocoris peremptus – type locality for species
  • † Piezocoris peritus – type locality for species

• 

  † Pimpla
  • † Pimpla appendigera – type locality for species
  • † Pimpla eocenica – type locality for species
  • † Pimpla morticina – type locality for species
  • † Pimpla rediviva – type locality for species
  • † Pimpla revelata – type locality for species
  • † Pimpla senilis – type locality for species
• Pinus
  • † Pinus florissanti
  • † Pinus hambachi
  • † Pinus wheeleri
• † Pipiza
  • † Pipiza melanderi – type locality for species
• † Pison
  • † Pison cockerellae – type locality for species
• Pituophis

  • 

    † Pituophis melanoleucus
• Pityophthorus
  • † Pityophthorus opaculus
• † Plagiopodiopsis
  • † Plagiopodiopsis cockerelliae
  • † Plagiopodiopsis scudderi
• † Planocephalus – type locality for genus
  • † Planocephalus aselloides – type locality for species
• Planolinoides
  • † Planolinoides duplex
• † Plastomenus – tentative report
  • † Plastomenus lachrymalis
• † Platanites
  • † Platanites marginata

• 

  Platanus
  • † Platanus florissanti – type locality for species
  • † Platanus nobilis
  • † Platanus raynoldsi
  • † Platanus raynoldsii
  • † Platanus wyomingensis
• Plateumaris
  • † Plateumaris flavipes
  • † Plateumaris germari
  • † Plateumaris primaeva – type locality for species
  • † Plateumaris pusilla
• † Platycheirus
  • † Platycheirus lethaeus – type locality for species
  • † Platycheirus persistens – type locality for species
• Platydema
  • † Platydema antiquorum – type locality for species
  • † Platydema bethunei – type locality for species
• † Platydracus
  • † Platydracus breviantennatus – type locality for species

• 

  † Platygonus
  • † Platygonus pollenae
• Platynus
  • † Platynus florissantensis – type locality for species
  • † Platynus insculptipennis – type locality for species
  • † Platynus tartareus – type locality for species
• † Platypedia
  • † Platypedia primigenia – type locality for species
• † Platyphylax
  • † Platyphylax florissantensis – type locality for species
• Platystethus
  • † Platystethus archetypus – type locality for species
  • † Platystethus carcareus – type locality for species

• 

  Plecia
  • † Plecia akerionana
  • † Plecia axeliana – type locality for species
  • † Plecia decapitata – type locality for species
  • † Plecia explanata – type locality for species
  • † Plecia gradata – type locality for species
  • † Plecia melanderi – type locality for species
  • † Plecia orycta – type locality for species
  • † Plecia rhodopterina – type locality for species
  • † Plecia tessella – type locality for species
  • † Plecia winchesteri – type locality for species
• † Plectiscidea
  • † Plectiscidea lanhami – type locality for species
• † Plectrotetrophanes – type locality for genus
  • † Plectrotetrophanes hageni – type locality for species
• † Plesiadapis
  • † Plesiadapis dubius
  • † Plesiadapis fodinatus
• † Plesiobaena
  • † Plesiobaena antiqua – or unidentified comparable form
• † Plesiosorex
  • † Plesiosorex coloradensis – type locality for species
• † Pleurolicus

• 

  † Pliohippus
  • † Pliohippus mirabilis – type locality for species
• † Plionictis
  • † Plionictis ogygia
• † Plochionus
  • † Plochionus lesquereuxi – type locality for species
• † Poabromylus
• Podabrus
  • † Podabrus cupesoides – type locality for species
  • † Podabrus florissantensis – type locality for species
  • † Podabrus fragmentatus – type locality for species
  • † Podabrus wheeleri – type locality for species
• Podiceps
• Podilymbus
  • † Podilymbus podiceps

• 

  † Poebrotherium
  • † Poebrotherium eximium
  • † Poebrotherium wilsoni
• † Poecilocapsus
  • † Poecilocapsus fremontii – type locality for species
  • † Poecilocapsus ostentus – type locality for species
  • † Poecilocapsus tabidus – type locality for species
  • † Poecilocapsus veterandus – type locality for species
  • † Poecilocapsus veternosus – type locality for species
• † Poecilognathus – type locality for genus
  • † Poecilognathus stigmalis – type locality for species
• † Pogonomyrmex
  • † Pogonomyrmex fossilis – type locality for species
• † Polemius
  • † Polemius crassicornis – type locality for species
• † Poliocoris – type locality for genus
  • † Poliocoris amnesis – type locality for species
• † Polioschistus – type locality for genus
  • † Polioschistus lapidarius – type locality for species
  • † Polioschistus ligatus – type locality for species
• † Poliosphageus – type locality for genus
  • † Poliosphageus psychrus – type locality for species
• Polycentropus
  • † Polycentropus aeternus – type locality for species
  • † Polycentropus eviratus – type locality for species
  • † Polycentropus exesus – type locality for species
• Polygraphus
  • † Polygraphus rufipennis
  • † Polygraphus wortheni – type locality for species
• † Polysphincta
  • † Polysphincta inundata – type locality for species
  • † Polysphincta mortuaria – type locality for species
  • † Polysphincta petrorum – type locality for species
• † Polystoechotites
  • † Polystoechotites piperatus – type locality for species
• † Ponerites – type locality for genus
  • † Ponerites coloradensis – type locality for species
  • † Ponerites eocenicus – type locality for species
  • † Ponerites hypoponeroides – type locality for species
• † Populites
  • † Populites heeri
• Populus
  • † Populus cinnamomoides
  • † Populus crassa
  • † Populus pyrifolia
  • † Populus wilmattae
• † Porizon
  • † Porizon exsectus – type locality for species
• Porzana

  • 

    † Porzana carolina
• † Potamogeton
  • † Potamogeton geniculatus
  • † Potamogeton verticillatus
• † Poteschistus – type locality for genus
  • † Poteschistus obnubilus – type locality for species
• † Praepapilio – type locality for genus
  • † Praepapilio colorado – type locality for species
  • † Praepapilio gracilis – type locality for species
• † Priabona
  • † Priabona florissantius – type locality for species
• † Prinecphora – type locality for genus
  • † Prinecphora balteata – type locality for species
• † Pristaulacus – type locality for genus
  • † Pristaulacus rohweri – type locality for species
  • † Pristaulacus secundus – type locality for species
• † Pristichampsus
• † Proapemon – type locality for genus
  • † Proapemon infernus – type locality for species
• † Probathyopsis
  • † Probathyopsis harrisorum – type locality for species
• † Procas
  • † Procas verberatus – type locality for species
  • † Procas vinculatus
• † Procerberus
  • † Procerberus andesiticus – type locality for species
  • † Procerberus grandis – type locality for species
• † Prochaetocnema – type locality for genus
  • † Prochaetocnema florissantella – type locality for species
• † Procoris – type locality for genus
  • † Procoris bechleri – type locality for species
  • † Procoris sanctaejohannis – type locality for species
• † Procrophius – type locality for genus
  • † Procrophius communis – type locality for species
  • † Procrophius costalis – type locality for species
  • † Procrophius languens – type locality for species
• † Proctotrypes
  • † Proctotrypes exhumatus – type locality for species
• † Procydnus – type locality for genus
  • † Procydnus devictus – type locality for species
  • † Procydnus divexus – type locality for species
  • † Procydnus eatoni – type locality for species
  • † Procydnus mamillanus
  • † Procydnus pronus – type locality for species
  • † Procydnus quietus – type locality for species
  • † Procydnus reliquus – type locality for species
  • † Procydnus vesperus – type locality for species
• † Procymus – type locality for genus
  • † Procymus cockerelli – type locality for species
• † Prodeporaides
  • † Prodeporaides laminarum – type locality for species
  • † Prodeporaides subterraneus – type locality for species
  • † Prodeporaides vulcan – type locality for species
  • † Prodeporaides wymani – type locality for species
• † Prodeporaus
  • † Prodeporaus curiosum – type locality for species
  • † Prodeporaus exanimale – type locality for species
  • † Prodeporaus exilis – type locality for species
  • † Prodeporaus minutissimus – type locality for species
  • † Prodeporaus smithii – type locality for species
• † Prodiacodon
  • † Prodiacodon tauricinerei
• † Prodipodomys
  • † Prodipodomys centralis

• 

  † Prodryas – type locality for genus
  • † Prodryas persephone – type locality for species
• † Proelectrotermes
  • † Proelectrotermes fodinae – type locality for species
• † Progloma – type locality for genus
  • † Progloma rohweri – type locality for species
• † Proheteromys
  • † Proheteromys sulculus
• † Proiridomyrmex – type locality for genus
  • † Proiridomyrmex vetulus – type locality for species
• † Prokalotermes
  • † Prokalotermes hagenii – type locality for species
• † Prolibythea – type locality for genus
  • † Prolibythea florissanti – type locality for species
  • † Prolibythea vagabunda – type locality for species
• † Prolimnocyon
  • † Prolimnocyon atavus
  • † Prolimnocyon haematus
• † Prolygaeus – type locality for genus
  • † Prolygaeus inundatus – type locality for species
• † Promioclaenus
  • † Promioclaenus acolytus
• † Pronemobius
  • † Pronemobius ornatipes – type locality for species
  • † Pronemobius tertiarius – tentative report
• † Propalaeanodon
• † Prophilanthus – type locality for genus
  • † Prophilanthus destructus – type locality for species
• † Proscalops
  • † Proscalops miocaenus – type locality for species
  • † Proscalops secundus – or unidentified comparable form
• † Prosigara – type locality for genus
  • † Prosigara flabellum – type locality for species
• † Prosoeca – type locality for genus
  • † Prosoeca florigera – type locality for species
• Prosopis
  • † Prosopis linearfolia
• † Protacnaeus – type locality for genus
  • † Protacnaeus tenuicornis – type locality for species
• † Protapate – type locality for genus
  • † Protapate contorta – type locality for species

• 

  † Protazteca – type locality for genus
  • † Protazteca capitata – type locality for species
  • † Protazteca elongata – type locality for species
  • † Protazteca hendersoni – type locality for species
  • † Protazteca quadrata – type locality for species
• † Proteleates – type locality for genus
  • † Proteleates centralis – type locality for species
• † Protenor
  • † Protenor imbecillis – type locality for species
• † Protictis
  • † Protictis proteus
• † Protipochus – type locality for genus
  • † Protipochus vandykei – type locality for species
• † Protochrysotoxum – type locality for genus
  • † Protochrysotoxum sphinx – type locality for species
• † Protoedalea
  • † Protoedalea brachystoma – type locality for species

• 

  † Protohippus
• † Protoibalia
  • † Protoibalia connexiva – type locality for species
• † Protolabis
  • † Protolabis heterodontus
• † Protoliarus – type locality for genus
  • † Protoliarus amabilis – type locality for species
  • † Protoliarus humatus – type locality for species
• † Protomarctus
  • † Protomarctus optatus
• † Protomelecta – type locality for genus
  • † Protomelecta brevipennis – type locality for species
• † Protoncideres – type locality for genus
  • † Protoncideres primus – type locality for species
• † Protoplatycera – type locality for genus
  • † Protoplatycera laticornis – type locality for species
• † Protoreodon

• 

  † Protorohippus
  • † Protorohippus venticolum
• † Protospermophilus
  • † Protospermophilus kelloggi
• † Protostephanus – type locality for genus
  • † Protostephanus ashmeadi – type locality for species
• † Prototomus
  • † Prototomus deimos
  • † Prototomus martis
  • † Prototomus phobos
  • † Prototomus secundarius
• † Protungulatum
  • † Protungulatum donnae
• Prunus
  • † Prunus coloradensis
  • † Prunus corrugis
  • † Prunus gracilis
• † Psammaecius
  • † Psammaecius sepultus – type locality for species
• † Psapharochus
  • † Psapharochus lengii – type locality for species
• † Psephenus
  • † Psephenus lutulentus – type locality for species
• Pseudacris
  • † Pseudacris triseriata

• 

  † Pseudaelurus
  • † Pseudaelurus stouti
• † Pseudhipparion
• † Pseudocimbex – type locality for genus
  • † Pseudocimbex clavatus – type locality for species
• † Pseudocylindrodon
  • † Pseudocylindrodon neglectus – or unidentified comparable form
• † Pseudomesauletes
  • † Pseudomesauletes culex – type locality for species
  • † Pseudomesauletes ibis – type locality for species
  • † Pseudomesauletes obliquus – type locality for species
  • † Pseudomesauletes striaticeps – type locality for species
• Pseudomyrmex
  • † Pseudomyrmex extinctus – type locality for species

• 

  † Pseudoprotoceras
  • † Pseudoprotoceras longinaris
• † Pseudosiobla
  • † Pseudosiobla megoura – type locality for species
  • † Pseudosiobla misera – type locality for species
• † Pseudosmylidia – type locality for genus
  • † Pseudosmylidia relicta – type locality for species
• † Pseudotetonius
  • † Pseudotetonius ambiguus
• † Pseudotheridomys
  • † Pseudotheridomys hesperus
• † Pseudotrimylus
  • † Pseudotrimylus compressus
  • † Pseudotrimylus roperi

• 

  † Psittacotherium
• Ptelea
  • † Ptelea cassiodes
• Pterocarya
  • † Pterocarya hispida
  • † Pterocarya roanensis – type locality for species
• † Pterogaulus
  • † Pterogaulus laevis
• † Pteromalus
  • † Pteromalus exanimis – type locality for species
• † Pteromogoplistes
  • † Pteromogoplistes grandis – type locality for species
  • † Pteromogoplistes smithii – tentative report
• † Pteronus
  • † Pteronus prodigus – type locality for species
• Pterostichus
  • † Pterostichus pumpellyi – type locality for species
  • † Pterostichus walcotti
• † Pterotriamescaptor – tentative report
  • † Pterotriamescaptor americanus – type locality for species

• 

  † Ptilodus
  • † Ptilodus kummae
• † Ptosima
  • † Ptosima abyssa – type locality for species
  • † Ptosima schaefferi – type locality for species
  • † Ptosima silvatica – type locality for species
• † Ptychoptera
  • † Ptychoptera miocenica – type locality for species
• † Pulverflumen
• Pycnoglypta
  • † Pycnoglypta lurida
• † Pythoceropsis – type locality for genus
  • † Pythoceropsis singularis – type locality for species

Q

• † Quadratomus
  • † Quadratomus grandis
• Quedius
  • † Quedius breweri – type locality for species
  • † Quedius chamberlini – type locality for species
  • † Quedius mortuus – type locality for species

• 

  Quercus
  • † Quercus balaninorum
  • † Quercus dumosoides
  • † Quercus greenlandica
  • † Quercus knowltoniana
  • † Quercus lyratiformis
  • † Quercus mohavensis
  • † Quercus orbata
  • † Quercus perdayana – type locality for species
  • † Quercus peritula
  • † Quercus schottii
  • † Quercus scottii
  • † Quercus scudderi
  • † Quercus sullyi

R

• Rallus
  • † Rallus limicola

• 

  † Ramoceros
  • † Ramoceros osborni
• † Rana
  • † Rana catesbeiana
• † Raphidia
  • † Raphidia creedei – type locality for species
• † Reichertella
  • † Reichertella fasciata – type locality for species
• Reithrodontomys
• † Reithroparamys
  • † Reithroparamys debequensis – type locality for species
• † Rembus – tentative report
  • † Rembus henshawi – type locality for species
• Reticulitermes
  • † Reticulitermes creedei – type locality for species
  • † Reticulitermes fossarum – type locality for species
• Rhabdomastix
  • † Rhabdomastix frigida – type locality for species
  • † Rhabdomastix labefactata – type locality for species
  • † Rhabdomastix praecursor – type locality for species
  • † Rhabdomastix primogenitalis
  • † Rhabdomastix profundi – type locality for species
  • † Rhabdomastix scudderi – type locality for species
• † Rhadinobrochus
  • † Rhadinobrochus extinctus – type locality for species

• 

  † Rhagio
  • † Rhagio fossitius – type locality for species
  • † Rhagio wheeleri – type locality for species
• † Rhagoderidea – type locality for genus
  • † Rhagoderidea striata – type locality for species
• Rhagonycha
  • † Rhagonycha hesperus – type locality for species
• † Rhamnites
  • † Rhamnites pseudostenophyllus
• † Rhamnus
  • † Rhamnus cleburni
  • † Rhamnus goldiana

• 

  † Rhamphomyia
  • † Rhamphomyia aeterna – type locality for species
  • † Rhamphomyia craterae – type locality for species
  • † Rhamphomyia enena – type locality for species
  • † Rhamphomyia fossa – type locality for species
  • † Rhamphomyia hypolitha – type locality for species
  • † Rhamphomyia inanimata – type locality for species
  • † Rhamphomyia infernalis – type locality for species
  • † Rhamphomyia interita – type locality for species
  • † Rhamphomyia morticina – type locality for species
  • † Rhamphomyia senecta – type locality for species
  • † Rhamphomyia sepulta – type locality for species
  • † Rhamphomyia spodites – type locality for species
  • † Rhamphomyia tumulata – type locality for species
• † Rhepocoris – type locality for genus
  • † Rhepocoris macrescens – type locality for species
  • † Rhepocoris minima – type locality for species
  • † Rhepocoris praetectus – type locality for species
  • † Rhepocoris praevalens – type locality for species
  • † Rhepocoris propinquans – type locality for species
• Rhineastes
  • † Rhineastes peltatus
  • † Rhineastes smithi

• 

  Rhineura
  • † Rhineura hatcheri
  • † Rhineura hatcherii – type locality for species
• † Rhingia
  • † Rhingia zephyrea – type locality for species
• † Rhingiopsis
  • † Rhingiopsis prisculus – type locality for species
• Rhizophagus
  • † Rhizophagus remotus

• 

  Rhus
  • † Rhus lesquereuxi
  • † Rhus migricans
  • † Rhus nigricans
  • † Rhus obscura
  • † Rhus stellariaefolia
• † Rhyparochromus
  • † Rhyparochromus verrillii – type locality for species
• † Rhysosternum
  • † Rhysosternum aeternabile – type locality for species
  • † Rhysosternum longirostre – type locality for species
• † Rhyssa
  • † Rhyssa petiolata – type locality for species
• † Rhyssomatus
  • † Rhyssomatus tabescens – type locality for species
• † Ribes
  • † Ribes errans – type locality for species
• † Riodinella – type locality for genus
  • † Riodinella nympha – type locality for species
• † Robinia
  • † Robinia lesquereuxi
  • † Robinia wardi
• † Rogas
  • † Rogas tertiarius – type locality for species
• Rosa
  • † Rosa hilliae

• 

  † Rothschildia
  • † Rothschildia fossilis – type locality for species
• Rubus
  • † Rubus coloradensis
• † Runaria – type locality for genus
  • † Runaria ostenta – type locality for species
• † Rupiforficula
  • † Rupiforficula inferna – type locality for species
  • † Rupiforficula labens – type locality for species
  • † Rupiforficula scudderi – type locality for species

S

• 

  Sabal
  • † Sabal grayana
  • † Sabal imperialis
• † Saccoloma
  • † Saccoloma gardneri
• † Sackenia – type locality for genus
  • † Sackenia arcuata – type locality for species
• Salix
  • † Salix coloradensis
  • † Salix coloradica – type locality for species
  • † Salix libbeyi
  • † Salix longiacuminata
  • † Salix longipetiolatum – or unidentified comparable form
  • † Salix ramaleyi
  • † Salix taxifolioides
• † Sambucus
  • † Sambucus newtoni

• 

  † Saniwa
• † Saperda
  • † Saperda caroli – type locality for species
  • † Saperda florissantensis – type locality for species
• † Saperdirhynchus – type locality for genus
  • † Saperdirhynchus priscotitillator – type locality for species
• † Sapindus
  • † Sapindus coloradensis
• † Sapromyza
  • † Sapromyza veterana – type locality for species
• † Saropogon
  • † Saropogon oblitescens – type locality for species
• Sassafras
  • † Sassafras CR010 informal

  • 

    † Sassafras hesperia
  • † Sassafras thermale
• † Scalopoides
  • † Scalopoides isodens
• Scaphinotus
  • † Scaphinotus serus – type locality for species
• † Scaptolenopsis – type locality for genus
  • † Scaptolenopsis wilmattae – type locality for species
• Sceloporus
  • † Sceloporus undulatus
• † Scenopagus
  • † Scenopagus edenensis
  • † Scenopagus priscus
• † Schaubeumys
  • † Schaubeumys clivosus
  • † Schaubeumys galbreathi
• † Schmaltzia
  • † Schmaltzia vexans
• † Sciabregma – type locality for genus
  • † Sciabregma rugosa – type locality for species
  • † Sciabregma tenuicornis – type locality for species
• Sciara
  • † Sciara dormitans – type locality for species
  • † Sciara florissantensis – type locality for species
  • † Sciara requieta – type locality for species
  • † Sciara sopora – type locality for species
• Sciomyza
  • † Sciomyza florissantensis – type locality for species
  • † Sciomyza manca
• † Sciophila
  • † Sciophila mirandula – type locality for species
• † Sciuravus

• 

  Sciurus
• Scolytus
  • † Scolytus piceae
• † Scoparidea – type locality for genus
  • † Scoparidea nebulosa – type locality for species
• † Scottimus
  • † Scottimus ambiguus
• † Scyphophorus
  • † Scyphophorus fossionis – type locality for species
  • † Scyphophorus laevis – type locality for species
  • † Scyphophorus tertiarius – type locality for species
• † Scythropus
  • † Scythropus somniculosus – type locality for species
• †Segestria
  • † Segestria scudderi – type locality for species
  • † Segestria secessa

• 

  † Selaginella
  • † Selaginella berthoudi
• † Selandria
  • † Selandria sapindi – type locality for species
• † Semanotus
  • † Semanotus puncticollis – type locality for species
• † Senoprosopis
  • † Senoprosopis antiquus – type locality for species
  • † Senoprosopis borealis – type locality for species
  • † Senoprosopis eureka – type locality for species
  • † Senoprosopis romeri – type locality for species
• Sequoia

  • 

    † Sequoia affinis
• Serica
  • † Serica antediluviana – type locality for species
  • † Serica cockerelli – type locality for species
• † Sespia
  • † Sespia nitida
• † Setodes
  • † Setodes abbreviata – type locality for species
  • † Setodes portionalis – type locality for species
• † Sialia
• † Sibinia
  • † Sibinia whitneyi – type locality for species
• † Sifrhippus
  • † Sifrhippus grangeri
• † Sigaretta
  • † Sigaretta florissantella – type locality for species
• Sigmodon
  • † Sigmodon curtisi
  • † Sigmodon minor
• † Silpha
  • † Silpha beutenmuelleri – type locality for species
  • † Silpha colorata – type locality for species
• † Silvius
  • † Silvius merychippi – type locality for species
• Simplocaria
  • † Simplocaria tessellata
• † Simpsonlemur
  • † Simpsonlemur jepseni
• † Simpsonodus
  • † Simpsonodus chacensis
• † Sinclairella
  • † Sinclairella dakotensis

• 

  † Sinonyx – or unidentified comparable form
• † Siphlurites – type locality for genus
  • † Siphlurites explanatus – type locality for species
• † Siphonophoroides – type locality for genus
  • † Siphonophoroides antiqua – type locality for species
  • † Siphonophoroides gillettei – type locality for species
  • † Siphonophoroides lassa – type locality for species
  • † Siphonophoroides pennatus – type locality for species
  • † Siphonophoroides simplex – type locality for species
• Sitona
  • † Sitona exitiorum – type locality for species
  • † Sitona paginarum
• † Sitones
  • † Sitones exitiorum
• Sitta
  • † Sitta carolinensis
• † Smicrorhynchus
  • † Smicrorhynchus macgeei
• † Smilax
  • † Smilax labidurommae

• 

  † Smilodectes
  • † Smilodectes gracilis
  • † Smilodectes mcgrewi
• † Solenopsites – type locality for genus
  • † Solenopsites minutus – type locality for species
• Sonoma
  • † Sonoma margemina
• Sorex
  • † Sorex arcticus
  • † Sorex hoyi
• † Sparganium
  • † Sparganium antiquum
• Spea

  • 

    † Spea bombifrons
• † Spermophagus
  • † Spermophagus pluto – type locality for species
  • † Spermophagus vivificatus – type locality for species
• Spermophilus
  • † Spermophilus elegans – or unidentified comparable form
  • † Spermophilus lateralis
  • † Spermophilus richardsonii
  • † Spermophilus tridecemlineatus
• † Sphegina
  • † Sphegina obscura – type locality for species

• 

  † Sphenocoelus
  • † Sphenocoelus uintensis
• † Spiladomyia – type locality for genus
  • † Spiladomyia simplex – type locality for species
• † Spiladopygia
  • † Spiladopygia exsulata – type locality for species
  • † Spiladopygia mortalis – type locality for species
• Spilogale
  • † Spilogale putorius
• † Spiniphora
  • † Spiniphora cockerelli – type locality for species
• Spizella

  • 

    † Spizella breweri
• † Spodotribus – type locality for genus
  • † Spodotribus terrulentus – type locality for species
• † Staphylea
  • † Staphylea acuminata
  • † Staphylea minutidens
• Staphylinus
  • † Staphylinus lesleyi
  • † Staphylinus vetulus – type locality for species
  • † Staphylinus vulcan – type locality for species
• † Steganus – type locality for genus
  • † Steganus barrandei – type locality for species
• † Stenoechinus
  • † Stenoechinus tantalus
• † Stenogomphus – type locality for genus
  • † Stenogomphus carletoni – type locality for species

• 

  † Stenolophus
  • † Stenolophus religatus – type locality for species
• † Stenopamera – type locality for genus
  • † Stenopamera subterrea – type locality for species
  • † Stenopamera tenebrosa – type locality for species
• † Stenosphenus
  • † Stenosphenus pristinus – type locality for species
• † Stenovelia – type locality for genus
  • † Stenovelia nigra – type locality for species
• Stenus
  • † Stenus morsei – type locality for species

• 

  Sterculia
  • † Sterculia rigida
• † Sterictiphora
  • † Sterictiphora konowi – type locality for species
• † Stibarus
  • † Stibarus obtusilobus
  • † Stibarus quadricuspis
• Stilbus
  • † Stilbus pallidus
• † Stipa
  • † Stipa florissanti
• † Stolopsyche – type locality for genus
  • † Stolopsyche libytheoides – type locality for species
• † Strategus
  • † Strategus cessatus – type locality for species
• † Stratimus
  • † Stratimus strobeli
• † Striaderes – type locality for genus
  • † Striaderes conradi – type locality for species
• † Strigorhysis
  • † Strigorhysis huerfanensis – type locality for species
• † Stygiochelys
  • † Stygiochelys estesi
• † Stylinodon
  • † Stylinodon mirus

• 

  † Subhyracodon
  • † Subhyracodon mitis – type locality for species
  • † Subhyracodon occidentalis
• † Submeryceros
  • † Submeryceros minor
• Sylvilagus
  • † Sylvilagus audubonii
• † Symphoromyia
  • † Symphoromyia subtrita – type locality for species
• † Synchroa
  • † Synchroa quiescens – type locality for species
• † Syntomostylus
  • † Syntomostylus rudis
• Syrphus
  • † Syrphus aphidopsidis – type locality for species
  • † Syrphus carpenteri – type locality for species
  • † Syrphus eocenicus – type locality for species
  • † Syrphus hendersoni – type locality for species
  • † Syrphus lithaphidis – type locality for species
  • † Syrphus petrographicus – type locality for species
  • † Syrphus platychiralis – type locality for species
  • † Syrphus willistoni – type locality for species
• † Systena
  • † Systena florissantensis – type locality for species

T

• † Tabanus
  • † Tabanus hipparionis – type locality for species
  • † Tabanus parahippi – type locality for species
• Tachinus
  • † Tachinus angustatus
  • † Tachinus elongatus
  • † Tachinus fimbriatus
  • † Tachinus schwarzi
  • † Tachinus sommatus – type locality for species
• Tachycineta

  • 

    † Tachycineta bicolor
• † Tachypeza
  • † Tachypeza primitiva – type locality for species
• Tachyporus
  • † Tachyporus annosus – type locality for species
  • † Tachyporus nimbicola
• † Tachys
  • † Tachys haywardi – type locality for species
• † Taeniopodites – type locality for genus
  • † Taeniopodites pardalis – type locality for species
• † Taeniurites – type locality for genus
  • † Taeniurites fortis – type locality for species
• † Tagalodes – type locality for genus
  • † Tagalodes inermis – type locality for species
• † Talpavus
• Tamiasciurus

  • 

    † Tamiasciurus hudsonicus
• Tanysphyrus
  • † Tanysphyrus lemnae
• † Taphacris – type locality for genus
  • † Taphacris bittaciformis – type locality for species
  • † Taphacris reliquata – type locality for species
• † Tapholyda
  • † Tapholyda caplani – type locality for species
• Tapirus
  • † Tapirus haysii
• † Taracticus
  • † Taracticus contusus – type locality for species
  • † Taracticus hypogaeus – type locality for species
  • † Taracticus renovatus – type locality for species
• Taxidea
  • † Taxidea taxus
• † Teilhardina

• 

  † Teleoceras
  • † Teleoceras americanum – type locality for species
  • † Teleoceras hicksi
  • † Teleoceras medicornutum
• † Teleocoris – type locality for genus
  • † Teleocoris pothetias – type locality for species
• † Teleoschistus
  • † Teleoschistus placatus – type locality for species
  • † Teleoschistus rigoratus – type locality for species
• † Tenebrionites
  • † Tenebrionites alatus – type locality for species
• † Tenebroides
  • † Tenebroides corrugata – type locality for species
• † Tenillus – type locality for genus
  • † Tenillus firmus – type locality for species
• † Tenor – type locality for genus
  • † Tenor speluncae – type locality for species
• † Tenthredella
  • † Tenthredella fenestralis – type locality for species
  • † Tenthredella oblita – type locality for species
  • † Tenthredella toddi – type locality for species

• 

  † Tenthredo
  • † Tenthredo avia – type locality for species
  • † Tenthredo infossa – type locality for species
  • † Tenthredo saxorum – type locality for species
  • † Tenthredo submersa – type locality for species
• † Teretrum
  • † Teretrum primulum – type locality for species
• † Tethneus
  • † Tethneus guyoti
  • † Tethneus hentzi – type locality for species
  • † Tethneus obduratus – type locality for species
  • † Tethneus provectus – type locality for species
  • † Tethneus robustus – type locality for species
  • † Tethneus twenhofeli – type locality for species
• † Tetigonia
  • † Tetigonia obtecta – type locality for species
  • † Tetigonia priscotincta – type locality for species
• † Tetonius
  • † Tetonius matthewi
  • † Tetonius mckennai – type locality for species

• 

  † Tetragnatha
  • † Tetragnatha tertiaria – type locality for species
• † Tetragoneura
  • † Tetragoneura peritula – type locality for species
• † Tetraonyx
  • † Tetraonyx minuscula – type locality for species
• † Tetraopes
  • † Tetraopes submersus – type locality for species
• † Tetrapus
  • † Tetrapus mayri – type locality for species
• Tetratoma
  • † Tetratoma concolor
• † Tettoraptor – type locality for genus
  • † Tettoraptor maculatus – type locality for species
• † Texasophis
  • † Texasophis fossilis
  • † Texasophis galbreathi – type locality for species
• † Texoceros
  • † Texoceros vaughani – type locality for species
• Thamnophis
  • † Thamnophis elegans

  • 

    † Thamnophis sirtalis
• † Thamnotettix
  • † Thamnotettix eocenicus – type locality for species
  • † Thamnotettix fundi – type locality for species
  • † Thamnotettix packardi – type locality for species
• † Thanasimus
  • † Thanasimus florissantensis – type locality for species
• Thanatophilus
  • † Thanatophilus coloradensis
• † Thaumastocladius – type locality for genus
  • † Thaumastocladius simplex – type locality for species

• 

  † Themira
  • † Themira saxifica – type locality for species
• † Theronia
  • † Theronia wickhami – type locality for species
• † Thisbemys
  • † Thisbemys elachistos
  • † Thisbemys perditus – type locality for species
• † Thlibomenus – type locality for genus
  • † Thlibomenus limosus – type locality for species
  • † Thlibomenus macer – type locality for species
  • † Thlibomenus parvus – type locality for species
  • † Thlibomenus perennatus – type locality for species
  • † Thlibomenus petreus – type locality for species
• † Thlimmoschistus – type locality for genus
  • † Thlimmoschistus gravidatus – type locality for species
• † Thnetoschistus – type locality for genus
  • † Thnetoschistus revulsus – type locality for species

• 

  † Thomisus
  • † Thomisus defossus – type locality for species
  • † Thomisus disjunctus – type locality for species
  • † Thomisus resutus – type locality for species
• Thomomys
  • † Thomomys talpoides
• † Thouinia
  • † Thouinia straciata
• † Thryptacodon
  • † Thryptacodon antiquus
  • † Thryptacodon australis – type locality for species
• † Thuja
  • † Thuja interrupta
• † Thylacodon
  • † Thylacodon montanensis
  • † Thylacodon pusillus

• 

  † Ticholeptus
• Tilia
  • † Tilia populifolia
• † Tillomys
  • † Tillomys senex – or unidentified comparable form
• † Tingis
  • † Tingis florissantensis – type locality for species
• † Tinodes – tentative report
  • † Tinodes paludigena – type locality for species
• Tipula – type locality for genus
  • † Tipula bilineata – type locality for species
  • † Tipula carolinae – type locality for species
  • † Tipula carpenteri – type locality for species
  • † Tipula clauda
  • † Tipula consumpta – type locality for species
  • † Tipula evanitura
  • † Tipula florissanta
  • † Tipula fmartinbrowni – type locality for species
  • † Tipula heilprini – type locality for species
  • † Tipula hepialina – type locality for species
  • † Tipula internecata
  • † Tipula lapillescens – type locality for species
  • † Tipula lethaea – type locality for species
  • † Tipula limi
  • † Tipula maclurei
  • † Tipula magnifica – type locality for species
  • † Tipula needhami – type locality for species
  • † Tipula paludis – type locality for species
  • † Tipula picta – type locality for species
  • † Tipula reliquiae – type locality for species
  • † Tipula revivificata – type locality for species
  • † Tipula rigens
  • † Tipula subterjacens – type locality for species
  • † Tipula tartari – type locality for species
  • † Tipula wilmatteae – type locality for species
• † Tipulidea
  • † Tipulidea distincta
• † Tiromerus – type locality for genus
  • † Tiromerus tabifluus – type locality for species
  • † Tiromerus torpefactus – type locality for species
• † Tiroschistus – type locality for genus
  • † Tiroschistus indurescens – type locality for species
• † Titanoeca
  • † Titanoeca ingenua – type locality for species

• 

  † Titanoides
  • † Titanoides looki
  • † Titanoides primaevus
• † Tithonomyia
  • † Tithonomyia atra – type locality for species
• † Tomarctus
  • † Tomarctus brevirostris – type locality for species
• † Tomoxia
  • † Tomoxia inundata – type locality for species
• † Torreya
  • † Torreya geometrorum
• † Tortricites
  • † Tortricites destructus – type locality for species

• 

  † Tortrix
  • † Tortrix florissantana – type locality for species
• † Torymus
  • † Torymus sackeni – type locality for species
• † Toxorhynchus
  • † Toxorhynchus arctus
  • † Toxorhynchus confectum – type locality for species
  • † Toxorhynchus corruptus – type locality for species
  • † Toxorhynchus florissantensis – type locality for species
  • † Toxorhynchus grandis – type locality for species
  • † Toxorhynchus minusculus – type locality for species
  • † Toxorhynchus oculatus – type locality for species
  • † Toxorhynchus pumilum
  • † Toxorhynchus refrenatum – type locality for species
  • † Toxorhynchus reventus – type locality for species
  • † Toxorhynchus scudderianum – type locality for species
• † Tracheliodes
  • † Tracheliodes mortuellus – type locality for species
• † Trapezonotus
  • † Trapezonotus exterminatus – type locality for species
  • † Trapezonotus stygialis – type locality for species

• 

  Trechus
  • † Trechus fractus – type locality for species
• † Tribochrysa – type locality for genus
  • † Tribochrysa firmata – type locality for species
  • † Tribochrysa inequalis – type locality for species
• † Tricentes
  • † Tricentes subtrigonus
• † Trichilia
  • † Trichilia florissanti
• † Trichiosomites – type locality for genus
  • † Trichiosomites obliviosus – type locality for species
• † Triga
  • † Triga coeni – type locality for species
• † Trigonias
  • † Trigonias osborni – type locality for species
• † Trigonorhinus
  • † Trigonorhinus sordidus – type locality for species
• † Trigonoscuta
  • † Trigonoscuta inventa – type locality for species
• † Triplax
  • † Triplax diluviana – type locality for species
  • † Triplax materna – type locality for species
  • † Triplax petrefacta – type locality for species
  • † Triplax submersa – type locality for species
• † Triplopus
  • † Triplopus implicatus
• † Trirhabda
  • † Trirhabda majuscula – type locality for species
  • † Trirhabda megacephala – type locality for species
  • † Trirhabda sepulta

• 

  † Tritemnodon
  • † Tritemnodon strenuus – or unidentified comparable form
• † Triumfetta
  • † Triumfetta ovata – type locality for species
• Trixagus
  • † Trixagus sericeus
• † Trixoscelis
  • † Trixoscelis patefacta – type locality for species
• † Trogosus
  • † Trogosus grangeri
• Trogoxylon
  • † Trogoxylon parallelopipedum
• † Trogus
  • † Trogus vetus – type locality for species
• † Tropideres
  • † Tropideres vastatus – type locality for species
• † Tropisternus
  • † Tropisternus limitatus – type locality for species
  • † Tropisternus vanus – type locality for species
• Trox
  • † Trox antiquus – type locality for species
• † Trypherus
  • † Trypherus aboriginalis – type locality for species
• † Tryphon
  • † Tryphon amasidis – type locality for species
  • † Tryphon cadaver – type locality for species
  • † Tryphon explanatum – type locality for species
  • † Tryphon florissantensis – type locality for species
  • † Tryphon lapideus – type locality for species
  • † Tryphon peregrinus – type locality for species
  • † Tryphon senex – type locality for species
• † Tychius
  • † Tychius evolatus
  • † Tychius ferox – type locality for species
  • † Tychius secretus – type locality for species
• † Tylecomnus
  • † Tylecomnus davisii – type locality for species
  • † Tylecomnus pimploides – type locality for species
• † Tylocomnus
  • † Tylocomnus creedensis – type locality for species

• 

  Typha
  • † Typha lesquereuxi
• † Tyrbula
  • † Tyrbula russelli – type locality for species
  • † Tyrbula scudderi – type locality for species

U

• † Ubiquitoxylon – type locality for genus ^[4]
  • † Ubiquitoxylon raynoldsii – type locality for species ^[4]
• † Uintacyon
  • † Uintacyon asodes
  • † Uintacyon massetericus – or unidentified comparable form
• † Uintanius
  • † Uintanius rutherfurdi
• † Uintascorpio – type locality for genus
  • † Uintascorpio halandrasorum – type locality for species

• 

  Ulmus
  • † Ulmus rhamnifolia
  • † Ulmus tenuinervis
• †Ulus
  • † Ulus minutus – type locality for species
• Urocyon
  • † Urocyon cinereoargenteus
• † Urolibellula – type locality for genus
  • † Urolibellula eocenica – type locality for species
• † Urortalis
  • † Urortalis caudatus – type locality for species
• † Urosigalphus
  • † Urosigalphus aeternus – type locality for species
• † Ursavus
  • † Ursavus pawniensis
• Ursus

  • 

    † Ursus americanus
• † Ustatochoerus
  • † Ustatochoerus medius
• † Utemylus
  • † Utemylus latomius – type locality for species
  • † Utemylus serior

V

• † Vanessa
  • † Vanessa amerindica – type locality for species
• † Vauquelinia
  • † Vauquelinia coloradensis
• † Verrallites – type locality for genus
  • † Verrallites cladurus – type locality for species
• † Viburnum
  • † Viburnum goldianum
  • † Viburnum solitarium
• † Vicia
• † Villa – type locality for genus
  • † Villa setosa – type locality for species

• 

  Vitis
  • † Vitis lobata
  • † Vitis olriki
• † Viverravus
  • † Viverravus acutus
  • † Viverravus gracilis
  • † Viverravus lutosus
  • † Viverravus minutus
  • † Viverravus politus – or unidentified comparable form
  • † Viverravus sicarius
• † Vrilletta
  • † Vrilletta monstrosa – type locality for species
  • † Vrilletta tenuistriata – type locality for species

• 

  † Vulpavus
  • † Vulpavus australis – or unidentified comparable form
  • † Vulpavus canavus
• Vulpes
  • † Vulpes stenognathus
  • † Vulpes velox
  • † Vulpes vulpes

W

• † Washakius
  • † Washakius izetti – or unidentified comparable form

• 

  † Weinmannia
  • † Weinmannia phenacophylla
• † Wickia – type locality for genus
  • † Wickia brevirhinus – type locality for species
• † Wilsoneumys
  • † Wilsoneumys planidens
• † Wilsonosorex
  • † Wilsonosorex conulatus
• † Woodwardia
  • † Woodwardia arctica

X

• 

  † Xantholinus
  • † Xantholinus tenebrarius – type locality for species
• † Xenacodon
  • † Xenacodon mutilatus – type locality for species
• † Xenicohippus
  • † Xenicohippus craspedotum
  • † Xenicohippus grangeri
  • † Xenicohippus osborni
• † Xenoberotha – type locality for genus
  • † Xenoberotha angustialata – type locality for species
• † Xestobium
  • † Xestobium alutaceum – type locality for species
• Xyela
  • † Xyela florissantensis – type locality for species
• Xyleborinus
  • † Xyleborinus saxeseni
• † Xyleborites – type locality for genus
  • † Xyleborites longipennis – type locality for species
• † Xylobiops
  • † Xylobiops lacustre – type locality for species

• 

  † Xylocopa
  • † Xylocopa gabrielae – type locality for species
• † Xylomya
  • † Xylomya inornata – type locality for species
• † Xylomyia
  • † Xylomyia moratula – type locality for species
• † Xylonomus
  • † Xylonomus sejugatus – type locality for species
• † Xyronomys
  • † Xyronomys robinsoni – type locality for species

Y

• † Ylasoia
  • † Ylasoia secunda – type locality for species
• † Yumaceras
  • † Yumaceras figginsi

Z

• † Zacallites – type locality for genus
  • † Zacallites balli – type locality for species

• 

  Zamia
  • † Zamia coloradensis
• † Zanycteris – type locality for genus
  • † Zanycteris honeyi – type locality for species
  • † Zanycteris paleocenus – type locality for species
• Zelkova
  • † Zelkova nervosa
  • † Zelkova planeroides
• † Zetobora
  • † Zetobora brunneri – type locality for species
• † Zingiberites
  • † Zingiberites dubius
• Zizyphus
  • † Zizyphus fibrillosus
  • † Zizyphus florissanti
• Zonotrichia
  • † Zonotrichia leucophrys
• † Zootermopsis
  • † Zootermopsis coloradensis – type locality for species

• 

  † Zygolophodon

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.