| 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 / 8.5; -82.8 |
| Approximate paleocoordinates | 8°18′N 82°12′W / 8.3°N 82.2°W / 8.3; -82.2 |
| 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.
Description
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.
Fossil content
These fossils have been reported from the formation:
- Strombina (Recurvina) penita, Strombina (Recurvina) recurva
- Distorsio decussata
- Marsupina bufo, M. nana
See also
- List of fossiliferous stratigraphic units in Costa Rica
- List of fossiliferous stratigraphic units in Panama
References
- ^ Charco Azul Formation at Fossilworks.org
Further reading
- P. Jung. 1989. Revision of the Strombina-group (Gastropoda; Columbellidae), fossil and living. Schweierische Paläontologische Abhandlungen 111:1-298