The Apón Formation is a geological
formation
Formation may refer to:
Linguistics
* Back-formation, the process of creating a new lexeme by removing or affixes
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Mathematics and science
* Cave formation or speleothem, a secondary ...
in northwestern
Venezuela
Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many Federal Dependencies of Venezuela, islands and islets in the Caribbean Sea. It com ...
(
Maracaibo Basin
The Maracaibo Basin, also known as Lake Maracaibo natural region, Lake Maracaibo depression or Lake Maracaibo Lowlands, is a foreland basin and one of the eight natural regions of Venezuela, found in the northwestern corner of Venezuela in South A ...
) and northern
Colombia
Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...
(La Guajira),
[García González et al., 2010] whose thick-bedded limestone interbedded with subordinate amounts of dark gray calcareous shale and sandy shale strata date back to the Early Cretaceous (Aptian, Late Aptian epoch).
[ Pterosaur remains of Ornithocheiridae, Ornithocheiridae indet. (=Anhangueridae, ?Anhangueridae indet.) are among the fossils that have been recovered from the formation.][Barrett et al., 2008, p.84]
Fossil content
The following fossils, among others, have been found in the Apón Formation at Toas island: ''Spiroculina, Spiroculina sp.'', ''Orbitolina concava'', ''Gryphaeostrea'', ''Amphidonte, Amphidonte (Ceratostreon) boussingaulti'', ''Ostrea, Ostrea sp.'', ''Amphitriscoelus, Amphitriscoelus waringi'', ''Requienia (bivalve), Requienia sp.'', ''Parahoplites, Parahoplites sp.'', ''Cheloniceras, Cheloniceras sp.'', ''Quinqueloculina, Quinqueloculina sp.'', ''Triloculina, Triloculina sp.'',[Apón Formation (Toas Island)]
at Fossilworks.org and ''Panopea, Panopea (Myopsis) plicata'' in Río Negro.[Apón Formation (Río Negro)]
at Fossilworks.org
See also
* List of pterosaur-bearing stratigraphic units
References
Bibliography
*
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{{DEFAULTSORT:Apon Formation
Geologic formations of Colombia
Geologic formations of Venezuela
Lower Cretaceous Series of South America
Cretaceous Colombia
Cretaceous Venezuela
Limestone formations
Marl formations
Shallow marine deposits
Aptian Stage
Fossiliferous stratigraphic units of South America
Paleontology in Venezuela
Geography of La Guajira Department
Geography of Zulia
Maracaibo basin
Colombia–Venezuela border