Top Qs
Timeline
Chat
Perspective
Abanico Formation
Sedimentary formation in Chile From Wikipedia, the free encyclopedia
Remove ads
Abanico Formation (Spanish: Formación Abanico) is a 3 kilometres (9,800 ft) thick sedimentary formation exposed in the Andes of Central Chile.[1] The formation has been deposited in a timespan from the Eocene to the Miocene. Abanico Formation's contact with the overlying Miocene Farellones Formation has been the subject of differing interpretations since the 1960s.[2] A small part of the formation crops out in the Mendoza Province of western Argentina.[3]
Remove ads
Description
The sediments accumulated in the Abanico Extensional Basin within a context of the Andean orogeny. The basin had a north–south elongated shape that spanned the latitudes of 29–38° S. Tectonic inversion from 21 to 16 million years ago made the basin collapse and the sediments to be incorporated to the Andean ranges.[4] The northern part of the basin inverted before the southern part.[2] Parts of the formation are known to have experienced Prehnite-pumpellyite facies metamorphism.[1]
Remove ads
Paleontological significance
Summarize
Perspective
The Tinguiririca fauna is known from the fossils found in the Abanico Formation near the Tinguiririca River. The rich faunal assemblage of the paleontological site, located in the La Gloria Member and dated at 33 to 31 Ma, gave name to the Tinguirirican South American land mammal age (SALMA), together with the Friasian named after the Río Frías Formation of the Aysén Region, the only ages defined in Chile.[5]
Fossil content
The following fossils have been recovered from the formation:
Remove ads
References
Further reading
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads