From Wikipedia, the free encyclopedia
The Cambridge Greensand is a geological unit in England whose strata are earliest
Cenomanian in age.
[1] It lies above the
erosive contact between the
Gault Formation and the
Chalk Group in the vicinity of
Cambridgeshire , and technically forms the lowest member bed of the West Melbury Marly Chalk Formation.
[2] It is a remanié deposit, containing
reworked fossils of late
Albian age, including those of dinosaurs and pterosaurs.
Description
The lithology is made out of
glauconitic
marl , described as a "chalk mud", containing abundant
ostracod ,
coccolith and
foram remains, with a concentration of
phosphatic nodules and bones at the base.
[1]
[2]
Vertebrate paleofauna
Birds
Birds
Genus
Species
Locality
Material
Notes
Images
Enaliornis
E. barrette
Braincases, vertebrae, pelvis [and] limb elements
[3]
This genus is the oldest known
hesperornithine
E sedgwicki
Hindlimb elements
[3]
E. seeleyi
Assorted cranial and postcranial elements
Dinosaurs
Ornithischians
Color key
Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
Ornithischians
Genus
Species
Locality
Material
Notes
Images
Anoplosaurus
A. curtonotus
"Partial postcranium"
[4]
A. major
"Cervical vertebrae."
[4] "Vertebrae."
[5]
Acanthopholis
A. eucercus
"[Two] caudal centra."
[4]
Nomen dubium
A. platypus
"Phalanx, caudal centra."
[4]
Nomen dubium
A. macrocercus
"Osteoderms."
[4] "Vertebrae, fragmentary skeleton elements."
[5]
Reassigned to
Syngonosaurus
A. stereocercus
"Osteoderms."
[4] "Vertebrae."
[5]
Nomen dubium
Eucercosaurus
E. tanyspondylus
"Vertebrae."
[4]
Trachodon
T. cantabrigiensis
"Dentary tooth."
[6]
Nomen dubium
Saurischians
Pterosaurs
Color key
Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
Ichthyosaurs
Lepidosauria
Color key
Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
Lepidosauria
Genus
Species
Locality
Material
Notes
Images
Patricosaurus
P. merocratus
[15]
Chimeric specimen
Invertebrates
Ammonites
See also
References
^
a
b Hart, Malcolm B.; Fox, Lyndsey R. (2020).
"Micropalaeontology and stratigraphical setting of the Cambridge Greensand" . Geological Society, London, Special Publications . 498 (1): 147–163.
Bibcode :
2020GSLSP.498..147H .
doi :
10.1144/SP498-2018-144 .
ISSN
0305-8719 .
S2CID
210304478 .
^
a
b
Cambridge Greensand at
BGS
^
a
b "Table 11.1," in Weishampel, et al. (2004). Page 215.
^
a
b
c
d
e
f
g "Table 17.1," in Weishampel, et al. (2004). Page 367.
^
a
b
c "Table 19.1," in Weishampel, et al. (2004). Page 417.
^ "Table 20.1," in Weishampel, et al. (2004). Page 443.
^ "Table 13.1," in Weishampel, et al. (2004). Page 270.
^
a
b Holgado, Borja (2021).
"On the validity of the genus Amblydectes Hooley 1914 (Pterodactyloidea, Anhangueridae) and the presence of Tropeognathinae in the Cambridge Greensand" . Anais da Academia Brasileira de Ciências . 93 (suppl 2).
doi :
10.1590/0001-3765202120201658 .
ISSN
1678-2690 .
^ Smith, Roy E.; Ibrahim, Nizar; Longrich, Nicholas; Unwin, David M.; Jacobs, Megan L.; Williams, Cariad J.; Zouhri, Samir; Martill, David M. (September 2023).
"The pterosaurs of the Cretaceous Kem Kem Group of Morocco" . PalZ . 97 (3): 519–568.
doi :
10.1007/s12542-022-00642-6 .
ISSN
0031-0220 .
^ Taissa Rodrigues & Alexander Wilhelm Armin Kellner (2013).
"Taxonomic review of the Ornithocheirus complex (Pterosauria) from the Cretaceous of England" . ZooKeys (308): 1–112.
doi :
10.3897/zookeys.308.5559 .
PMC
3689139 .
PMID
23794925 .
^ Unwin D.M., 2001, "An overview of the pterosaur assemblage from the Cambridge Greensand (Cretaceous) of Eastern England", Mitteilungen aus dem Museum für Naturkunde in Berlin , Geowissenschaftliche Reihe 4: 189–221
^ Averianov A.O. (2012). "Ornithostoma sedgwicki – valid taxon of azhdarchoid pterosaurs". Proceedings of the Zoological Institute RAS . 316 (1): 40–49.
^
a
b Smith, Roy E.; Martill, David M.; Unwin, David M.; Steel, Lorna (February 2021).
"Edentulous pterosaurs from the Cambridge Greensand (Cretaceous) of eastern England with a review of Ornithostoma Seeley, 1871" . Proceedings of the Geologists' Association . 132 (1): 110–126.
doi :
10.1016/j.pgeola.2020.10.004 .
^ Valentin Fischer; Nathalie Bardet; Myette Guiomar & Pascal Godefroit (2014).
"High Diversity in Cretaceous Ichthyosaurs from Europe Prior to Their Extinction" . PLOS ONE . 9 (1): e84709.
Bibcode :
2014PLoSO...984709F .
doi :
10.1371/journal.pone.0084709 .
PMC
3897400 .
PMID
24465427 .
^ P. M. Barrett and S. E. Evans. 2002. A reassessment of the Early Cretaceous reptile 'Patricosaurus merocratus' Seeley from the Cambridge Greensand, Cambridgeshire, UK. Cretaceous Research 23:231-240
^ C. W. Wright and W. J. Kennedy. 1979. Origin and evolution of the Cretaceous micromorph ammonite family Flickiidae. Palaeontology 22:685-704