Río Frías FormationRío Frías Formation (Spanish: Formación Río Frías) is a Middle Miocene geologic formation made up sedimentary rock located in Aysén Region, western Patagonia
MayoanLaventan and precedes the Chasicoan age. The age is named after the Río Mayo Formation in the Golfo San Jorge Basin of Patagonia, Argentina. Paleo Database:
South American land mammal ageretrieved 2018-09-10 Río Negro Formation Pérez, Mariano (2012), Análisis paleoambiental del miembro superior de la Formación Río Negro (Mioceno-Plioceno
La Venta (Colombia)Group, which is divided into the younger Villavieja Formation and the older La Victoria Formation. The La Venta fauna contained ancient species of animal
Abanico Formationafter the Río Frías Formation of the Aysén Region, the only ages defined in Chile. The following fossils have been recovered from the formation: Muñoz et