Английская Википедия:Dos Bocas Formation

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Шаблон:Infobox rockunit

The Dos Bocas Formation is a sedimentary geological formation of the Progreso Basin in southwestern Ecuador. It is dated to the Chattian, about 26 to 24 Ma, (Deseadan in the SALMA classification).

Description

Файл:Montañita-Olón locality (stratigraphy) - Dos Bocas Formation.png
Stratigraphy of the Montañita-Olón locality

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 dolphin Urkudelphis were recovered from the formation.[1][2]

Fossil content

The formation has provided fossils of:

See also

References

Шаблон:Reflist