Río Frías Formation
| Río Frías Formation | ||
|---|---|---|
Ma | ||
| Type | Approximate paleocoordinates 45°12′S 66°18′W / 45.2°S 66.3°W | |
| Region | Aysén Region | |
| Country |  Chile | |
| Extent | Aysén Basin | |
| Type section | ||
| Named for | Río Frías | |
| Named by | Santiago Roth | |
| Year defined | 1898 | |
  Río Frías Formation (Chile) | ||
Río Frías Formation (
South American Land Mammal Ages is named after the formation.[3]
Description
Río Frías Formation was discovered by Santiago Roth in the summer of 1897–98. Roth was a Swiss immigrant who had been sent to survey the area by
fluvial environment, characterized by an intermontane valley flanked by Cretaceous basement rocks.[5]
Fossil content
The following fossils have been found in the formation:
| Group | Fossils | Image | Notes |
|---|---|---|---|
| Mammals | Astrapotherium hesperinum |  |
|
| Prothylacinus patagonicus |  | ||
| Adinotherium sp. |  | ||
| Nesodon sp. |  | ||
| Protypotherium sp. |  | ||
| Borhyaena tuberata |  | ||
| Theosodon sp. | |||
| Cladosictis patagonica |  | ||
| Pachyrukhos sp. | |||
| Homalodotherium sp. |  | ||
Platyrrhini indet. |
References
- ^ a b c Marshall & Salinas, 1990
- ^ Marshall, 1990
- ^ Paleo Database: Friasian
- ^ Bostelmann et al., 2012, p.44
- ^ Bellosi et al., 2014, p.40
- ^ Río Frías at Fossilworks.org
- ^ Alto Río Cisnes at Fossilworks.org
Bibliography
- Abello, María Alejandra, and David Rubilar Rogers. 2012. Revisión del género Abderites Ameghino, 1887 (Marsupialia, Paucituberculata). Ameghiniana 49(2). 164–184. Accessed 2019-02-15.
- Bellosi, Eduardo S. et al. 2014. Ambientes asociados a la fauna Friasense (Mioceno Medio) en Alto río Cisnes (Aysén, Chile), 40–41. XIV Reuñión Argentina de Sedimentología. Accessed 2018-09-10.
- Bostelmann, J.E. et al. 2012. The Alto Río Cisnes Fossil Fauna (Río Frías Formation, Early-Middle Miocene, Friasian SALMA): A keystone and paradigmatic vertebrate assemblage of the South American Fossil Record, 44–45. III Simposio Paleontología en Chile. Accessed 2018-09-10.
- Marshall, Larry G. 1990. Fossil Marsupialia from the type Friasian land mammal age (Miocene), Alto Río Cisnes, Aisén, Chile. Revista Geológica de Chile 17. 19–55. Accessed 2017-10-21.
- Marshall, Larry G., and Patricia Salinas. 1990. Stratigraphy of the Río Frías Formation (Miocene) along the Alto Río Cisnes, Aisén, Chile. Revista Geológica de Chile 17. 57–87. Accessed 2017-10-21.
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