The Jimol Formation (
Spanish : Formación Jimol , N1j) is a
fossiliferous
geological formation of the
Cocinetas Basin in the northernmost
department of
La Guajira . The formation consists of
calcareous
lithic and
fossiliferous sandstones,
siltstones and
mudstones . The Jimol Formation dates to the
Neogene period;
Burdigalian stage,
Santacrucian in the
SALMA classification, and has a maximum thickness of 203 metres (666 ft).
Etymology
The formation was defined by Renz in 1960 and named after Cerro Jimol.
[1]
Description
Lithologies
The Jimol Formation consists of
calcareous
lithic and
fossiliferous sandstones,
siltstones and
mudstones .
[2]
Stratigraphy and depositional environment
The Jimol Formation overlies the
Uitpa Formation and is overlain by the
Castilletes Formation . The age has been estimated to be
Early Miocene (17.9 to 16.7 Ma), corresponding to the
Santacrucian in the
SALMA classification. The invertebrate fauna of the Jimol Formation is similar to the fauna found in the latest Early Miocene
Cantaure Formation of Venezuela and the
Culebra Formation of
Panama .
[3] The Jimol Formation was deposited in a beach to
shallow marine environment,
[4]
inner shelf depth (less than 50 metres' [160 ft] water depth). This unit is correlated with the upper
Agua Clara and lower
Cerro Pelao Formations of the Venezuelan
Falcón Basin .
[5]
Petroleum geology
The Jimol Formation is a
reservoir and
seal rock formation in the
Guajira Basin .
[6]
Fossil content
Group
Fossils
Notes
Reptiles
Crocodylidae ,
Gavialidae
Fishes
Chilomycterus sp.
Dalatiidae ,
Myliobatidae ,
Lamnidae ,
Hemigaleidae ,
Carcharhinidae
Invertebrates
Calliostoma sp. ,
Turbo sp. ,
Modulus tamanensis ,
Turritella (Bactrospira) sp. cf. altilira ,
Turritella (Turritella) cocoditana ,
Turritella (Turritella) machapoorensis ,
Turritella (Turritella) matarucana ,
Architectonica (Architectonica) nobilis ,
Rhinoclavis (Ochetoclava) venada ,
Potamides suprasulcatus ,
Terebralia dentilabris ,
Petaloconchus sculpturatus ,
Cirsotrema undulatum ,
Crepidula cantaurana ,
Crepidula insculpta ,
Crepidula plana ,
Calyptraea sp. cf. centralis ,
Crucibulum (Dispotaea) sp. cf. springvaleense ,
Trochita trochiformis ,
Charadreon n. sp. ,
Natica sp. ,
Naticarius sp. ,
Glossaulax paraguanensis ,
Polinices sp. cf. nelsoni ,
Sinum gabbi ,
Stigmaulax sp. ,
Pachycrommium sp. ,
Orthaulax sp. ,
Strombus sp. ,
Ficus sp. cf. carbasea ,
Luria sp. ,
Muracypraea sp. cf. hyaena ,
Calotrophon sp. cf. gatunensis ,
Cymia cocoditana ,
Eupleura kugleri ,
Siphonochelus (Laevityphis) cf. sawkinsi ,
Siratus cf. denegatus ,
Vokesimurex sp. cf. gilli ,
Antillophos sp. cf. gatunensis ,
Cymatophos cocoditana ,
Cymatophos paraguanensis ,
Vasum quirosense ,
Solenosteira sp. ,
Latirus sp. ,
Turbinella falconensis ,
Melongena consors ,
Anachis sp. ,
Strombina sp. ,
Persicula venezuelana ,
Prunum quirosense ,
Conomitra sp. ,
Eburna sp. ,
Oliva sp. ,
Olivella sp. ,
Bivetiella sp. cf. gabbiana ,
Euclia werenfelsi ,
Saccella gracillima ,
Glycymeris sp. ,
Amusium aguaclarense ,
Conus sp. cf. chipolanus ,
Conus sp. cf. molis ,
Conus talis ,
Strioterebrum ulloa ,
Terebra (Paraterebra) sulcifera ,
Clathrodrillia sp. ,
Cruziturricula sp. ,
Hindsiclava henekeni ,
Knefastia sp. ,
Polystira sp. ,
Adrana sp. ,
Politoleda forcati ,
Anadara (Cunearca) zuliana ,
Anadara (Grandiarca) chiriquiensis ,
Anadara (Potiarca) inutilis ,
Anadara (Rasia) sp. cf. cornellana ,
Anadara (Tosarca) sp. cf. veatchi ,
Tucetona sp. cf. democraciana ,
Mytilus sp. cf. canoasensis ,
Paraleptopecten quirosensis ,
Hyotissa sp. ,
Spondylus sp. ,
Pseudochama quirosana ,
Trachycardium sp. ,
Leopecten sp. ,
Lindapecten buchivacoanus ,
Crassostrea sp. ,
Dendostrea democraciana ,
Plicatula sp. ,
Anodontia sp. ,
Lucina sp. cf. pensylvanica ,
Phacoides sp. cf. pectinatus ,
Glyptoactis paraguanensis ,
Arcinella yaquensis ,
Chama berjadinensis ,
Dallocardia sp. cf. sanctidavidis ,
Apiocardia n. sp. aff. aminensis ,
Crassinella sp. ,
Eucrassatella (Hybolophus) venezuelana ,
Micromactra maracaibensis ,
Eurytellina paraguanensis ,
Psammacoma falconensis ,
Psammotreta hadra ,
Donax sp. ,
Tagelus (Mesopleura) n. sp. aff. divisus ,
Solecurtus sp. ,
Solena sp. ,
Abra sp. ,
Anomalocardia sp. ,
Globivenus palmeri ,
Semele sp. ,
Chione sp. ,
Chionopsis paraguanensis ,
Clementia dariena ,
Cyclinella venezuelana ,
Dosinia sp. ,
Lamelliconcha labreana ,
Lirophora quirosensis ,
Macrocallista n. sp. aff. maculata ,
Panchione n. sp. aff. macrtropsis ,
Caryocorbula fortis ,
Caryocorbula quirosana ,
Hexacorbula cruziana ,
Dentalium sp. ,
Balanidae indet. ,
Callianassidae indet. ,
Cidaroida indet. ,
Echinoida indet. ,
Turridae indet. ,
Veneridae indet.
See also
Geology of the Eastern Hills
Cesar-Ranchería Basin
Honda Group
Abanico Formation
References
^ Moreno et al., 2015, p.7
^ Moreno et al., 2015, pp.18-27
^
a
b Moreno et al., 2015, p.23
^ Rodríguez & Londoño, 2002, p.137
^ Moreno et al., 2015, p.27
^ ANH, 2010
^
a
b Moreno et al., 2015, p.35
^ Aguilera et al., 2017, p.15
^ Hendy et al., 2015, p.52
^ Hendy et al., 2015, p.53
^ Hendy et al., 2015, p.54
Bibliography
Local geology
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Guajira Basin - Colombia Open Round 2010 , 1.
ANH . Accessed 2017-08-30.
Moreno, F.; A.J.W. Hendy; L. Quiroz; N. Hoyos; D.S. Jones; V. Zapata; S. Zapata; G.A. Ballen, and Edwin
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C. Jaramillo . 2015.
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Swiss Journal of Palaeontology 134. 5–43. Accessed 2017-08-08.
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Paleontology
Maps
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