Jama Formation | |
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Stratigraphic range: Pliocene-Early Pleistocene (Montehermosan-Ensenadan) ~ | |
Type | Geological formation |
Lithology | |
Primary | Claystone, sandstone |
Location | |
Coordinates | 0°12′S80°18′W / 0.2°S 80.3°W |
Approximate paleocoordinates | 0°18′S79°54′W / 0.3°S 79.9°W |
Region | Manabí Province |
Country | Ecuador |
Type section | |
Named for | Jama |
The Jama Formation is a Pliocene to Early Pleistocene (Montehermosan to Ensenadan in the SALMA classification) geological formation in Ecuador. The claystones and sandstones were deposited in a coastal environment. The age of the Jama Formation is constrained by 40Ar/39Ar dating of tephra beds. [1] The formation is correlated to the Charco Azul Formation of western Panama and southeastern Costa Rica. [2]
The formation is subdivided in, from top to base:
The formation has provided bivalve, gastropod and scaphopod fossils.