Dos Bocas Formation

The Dos Bocas Formation is a Chattian, about 26 to 24 Ma,[1] (Deseadan in the SALMA classification) geologic formation of the Progreso Basin in southwestern Ecuador.

Dos Bocas Formation
Stratigraphic range: Chattian
(Deseadan)
~26–24 Ma
TypeGeological formation
Unit ofSubibaja Group
UnderliesVillingota Formation
OverliesZapotal Formation
Lithology
PrimarySandstone
Location
Coordinates1.8°S 80.8°W / -1.8; -80.8
Approximate paleocoordinates3.6°S 75.5°W / -3.6; -75.5
RegionSanta Elena Province
Country Ecuador
ExtentProgreso Basin
Dos Bocas Formation (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:

See also

References

  1. Montañita/Olón at Fossilworks.org
  2. Tanaka et al., 2017

Bibliography

Further reading

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