Río Frías Formation
Geologic formation in western Patagonia / From Wikipedia, the free encyclopedia
Río Frías Formation (Spanish: Formación Río Frías) is a Middle Miocene geologic formation made up sedimentary rock located in Aysén Region, western Patagonia. The formation crops out along the upper course of Cisnes River (Spanish: Río Cisnes).[1] Marsupial fossils have been found in the formation.[2] The Friasian period in the South American Land Mammal Ages is named after the formation.[3]
Quick Facts Type, Overlies ...
Río Frías Formation | |
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Stratigraphic range: Middle Miocene (Friasian) ~16.5–15.5 Ma | |
Type | Geological formation |
Overlies | Ñirehuao Formation |
Lithology | |
Primary | Tuff, tuffite, siltstone, unconsolidated sand, conglomerate |
Location | |
Coordinates | 44.6°S 71.2°W / -44.6; -71.2 |
Approximate paleocoordinates | 45.2°S 66.3°W / -45.2; -66.3 |
Region | Aysén Region |
Country | Chile |
Extent | Aysén Basin |
Type section | |
Named for | Río Frías |
Named by | Santiago Roth |
Year defined | 1898 |
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