| Seca Formation | |
|---|---|
| Stratigraphic range: Late Eocene (Divisaderan-Tinguirirican) ~ | |
| Type | Geological formation |
| Unit of | Ancón Group |
| Underlies | Punta Ancón Formation |
| Overlies | Socorro Formation |
| Lithology | |
| Primary | Shale |
| Location | |
| Coordinates | 2°18′S 80°48′W / 2.3°S 80.8°W |
| Approximate paleocoordinates | 4°48′S 73°48′W / 4.8°S 73.8°W |
| Region | Santa Elena Province |
| Country |  Ecuador |
| Extent | Progreso Basin |
  Seca Formation, Ecuador (Ecuador) | |
The Seca Formation is a Late Eocene (Divisaderan to Tinguirirican in the SALMA classification) geologic formation of the Progreso Basin in southwestern Ecuador. The shales of the formation have provided fossils of the marine snake Pterosphenus sheppardi.[1]
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.[2] The formation is a reservoir rock,[3] and potential source rock,[4] in the oil-rich Progreso Basin.
See also
References
Bibliography
- Lorenzo, Erica et al. 2018. Correlación geoquímica entre crudos y rocas del sistema petrolero de la península de Santa Elena y el golfo de Guayaquil. Boletín de Geología 40. 31–42. Accessed 2018-09-11.
Further reading
- R. Hoffstetter. 1958. Un serpent marin du genre Pterosphenus (Pt. Sheppardi nov. sp.) dans L’Éocène supérieur de L’Équateur (Amérique de Sud). Bulletin de la Société Géologique de France 6:45-50
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