Charco Azul Formation
| Charco Azul Formation | |
|---|---|
| Stratigraphic range: Pliocene | |
| Type | Formation |
| Unit of | Charco Azul Group |
| Underlies | Armuelles Formation |
| Lithology | |
| Primary | Shale |
| Other | Tuff |
| Location | |
| Coordinates | 8°30′N 82°48′W / 8.5°N 82.8°W |
| Approximate paleocoordinates | 8°18′N 82°12′W / 8.3°N 82.2°W |
| Region | Chiriquí Province |
| Country |  Costa Rica Panama |
| Type section | |
| Named for | Charco Azul |
  Charco Azul Formation (Panama) | |
Charco Azul Formation is a geologic formation of the Charco Azul Group in western Panama and southeastern Costa Rica. It preserves gastropod fossils dating back to the Pliocene period.[1]
Description
[edit]The Charco Azul Formation comprises tuffaceous shales deposited in a deep marine environment The formation unconformably underlies the Armuelles Formation. The formation is correlated to the Jama and Canoa Formations of Ecuador.[1]
Fossil content
[edit]These fossils have been reported from the formation:[1]
- Strombina (Recurvina) penita, Strombina (Recurvina) recurva
- Distorsio decussata
- Marsupina bufo, M. nana
See also
[edit]
- List of fossiliferous stratigraphic units in Costa Rica
- List of fossiliferous stratigraphic units in Panama
References
[edit]- ^ a b c Charco Azul Formation at Fossilworks.org
Further reading
[edit]- P. Jung. 1989. Revision of the Strombina-group (Gastropoda; Columbellidae), fossil and living. Schweierische Paläontologische Abhandlungen 111:1-298