Dos Bocas Formation
Dos Bocas Formation Stratigraphic range: Chattian (Deseadan) ~ | |
---|---|
Type | Geological formation |
Unit of | |
Underlies | |
Overlies | |
Lithology | |
Primary | Sandstone |
Location | |
Coordinates | 1°48′S 80°48′W / 1.8°S 80.8°WCoordinates: 1°48′S 80°48′W / 1.8°S 80.8°W |
Approximate paleocoordinates | 3°36′S 75°30′W / 3.6°S 75.5°W |
Region | Santa Elena Province |
Country | Ecuador |
Extent | |
Dos Bocas Formation (Ecuador) |
The Dos Bocas Formation is a Chattian, about 26 to 24 Ma,[1] (Deseadan in the SALMA classification) geologic formation of the in southwestern Ecuador.
Description[]
The formation comprises moderately-sorted, fine to medium sandstones with angular quartz-feldspathic clasts. Conspicuous rounded green grains are probably glauconite, but berthierine cannot be dismissed. The matrix is micritic and volcanogenic, possibly bentonitic. The formation was deposited in an estuarine to mid shelf environment. Fossils of sharks, turtles and the tropical Urkudelphis were recovered from the formation.[1]
Fossil content[]
The formation has provided fossils of:
- Carcharocles angustidens
- Urkudelphis chawpipacha[2]
- Chelonioidea indet.
See also[]
References[]
- ^ a b Montañita/Olón at Fossilworks.org
- ^ Tanaka et al., 2017
Bibliography[]
- A new tropical Oligocene dolphin from Montañita/Olón, Santa Elena, Ecuador. PLoS One 12. e0188380. Accessed 2019-02-09. ; ; ; , and . 2017.
Further reading[]
- 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 2018-10-01. ; ; ; ; , and . 2018.
Categories:
- Geologic formations of Ecuador
- Oligocene Series of South America
- Paleogene Ecuador
- Chattian Stage
- Deseadan
- Sandstone formations
- Tidal deposits
- Open marine deposits
- Paleontology in Ecuador
- Geography of Santa Elena Province