Coihaique Group

Short description: Geological formations in Patagonia

Coihaique Group
Stratigraphic range: Late Jurassic–Aptian

Toqui Formation with Chilesaurus fossils

Type| Geologic group
Unit of| Aysén Basin
Sub-units| Apeleg Formation
Katterfeld Formation
Toqui Formation
Underlies| Divisadero Group
Overlies| Ibáñez Formation
Lithology
Primary| Shale, volcaniclastic rocks, sandstone
Other| Turbidite
Location
Region| Aysén Region, Patagonia
Country|  Chile

The Coihaique Group is a group of geological formations in northwestern Patagonia. From top to bottom the formations that make the group are Apeleg, Katterfeld and Toqui. The contact between the formations of the group are diachronous with Katterfeld Formation interfingering with the formations on top and below it. The lower and upper boundaries of the group are unconformities formed by erosion. The older parts of Coihaique Group represent a marine transgression while the younger parts evidences a return to non-marine conditions.[1]

## Fossils in Toqui Formation

The rock formation preserves fossils from the Late Jurassic period of the Mesozoic Era.

Fossils of Chilesaurus (147 Ma) were found in the Aysén Region of Patagonia. It is an extinct genus of theropods in the family Tetanurae.[2] The fossil record also comprises a sauropod Titanosaur, a Camarasaur and a Diplodocid.

## See also

* Geology of Aysén Region
* Geology of Chile
* Tobífera Formation

## References

1. ↑ Suárez, Manuel; de la Cruz, Rita (1994). "Estratigrafía y paleogeografía mesozoica de Aisén nororiental (45-46 lat.s.), Chile" (in es). 7° Congreso Geológico Chileno. Concepción: Universidad de Concepción. pp. 538–542. http://biblioteca.sernageomin.cl/opac/DataFiles/7166pp538_542.pdf.
2. ↑ news.nationalgeographic.com National Geographic.com: "T. rex's Oddball Vegetarian Cousin Discovered", by Michael D. Lemonick, 2015-04-27.

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