Seca Formation, Ecuador

The Seca Formation is a Late Eocene geologic formation of the Progreso Basin in southwestern Ecuador. The shales of the formation have provided fossils of the marine snake Pterosphenus sheppardi, P.shepardi is the only species of the genus in South America.

Description

The Seca Formation, part of the Ancón Group, conformably overlies the Socorro Formation and is overlain by the Punta Ancón Formation. The Seca Formation comprises grey to greenish shales deposited in a marine platform with submarine fans environment. The formation is a reservoir rock, and potential source rock, in the oil-rich Progreso Basin.