Underlies Marañon Formation Thickness Approx. 350 to 1074 m Named for Pebas District | Overlies Chambira Formation Other coal/lignite Primary Siltstone, Mudstone | |
Country Peru, Brazil, Colombia & Ecuador | ||
The Pebas Formation is a lithostratigraphic unit of Miocene age, found in western Amazonia. The formation extends over a million square kilometres, including parts of Brazil, Peru, Ecuador and Colombia. It is interpreted as representing the deposits of a lake or series of lakes, formed within the foreland basin of the Andes mountain belt. It is known for its abundant fossil ostracods and molluscs and an unusually diverse group of crocodylians.
References
Pebas Formation Wikipedia(Text) CC BY-SA