| Apón Formation | |
| Type: | Geological formation |
| Period: | Aptian |
| Age: | Early Cretaceous (Late Aptian) |
| Prilithology: | Limestone, marl |
| Otherlithology: | Calcareous and sandy shales |
| Namedfor: | Apón River |
| Region: | La Guajira, Maracaibo Basin |
| Country: | |
| Coordinates: | 10.9583°N -71.6472°W |
| Paleocoordinates: | 7.7°N -41.1°W |
| Subunits: | Machiques Member |
| Underlies: | Aguardiente Formation |
| Overlies: | Río Negro Formation |
The Apón Formation is a geological formation in northwestern Venezuela (Maracaibo Basin) and northern Colombia (La Guajira),[1] whose thick-bedded limestone interbedded with subordinate amounts of dark gray calcareous shale and sandy shale strata date back to the Early Cretaceous (Late Aptian epoch). Pterosaur remains of Ornithocheiridae indet. (=?Anhangueridae indet.) are among the fossils that have been recovered from the formation.[2]
The following fossils, among others, have been found in the Apón Formation at Toas island: Spiroculina sp., Orbitolina concava, Gryphaeostrea, Amphidonte (Ceratostreon) boussingaulti, Ostrea sp., Amphitriscoelus waringi, Requienia sp., Parahoplites sp., Cheloniceras sp., Quinqueloculina sp., Triloculina sp.,[3] and Panopea (Myopsis) plicata in Río Negro.[4]