User:Magnatyrannus/Cerro Boleadoras Formation
| Cerro Boleadoras Formation | |
|---|---|
| Stratigraphic range: latest Burdigalian-Langhian (Santacrucian-Friasian) ~ | |
| Overlies | Santa Cruz Formation |
| Lithology | |
| Primary | Sandstone, mudstone |
| Other | Limestone |
| Location | |
| Country |  Argentina |
| Extent | Golfo San Jorge Basin |
| Type section | |
| Region | Santa Cruz Province |
| Country | Argentina |
The Cerro Boleadoras Formation is a geological formation in southern Patagonia, Argentina which dates from the Early Miocene (Santacrucian SALMA) to the Middle Miocene (Friasian SALMA), around 17.5 to 16.5 million years ago. It predominantly consists of pyroclastic deposits, which were deposited in a semi-arid environment. It is divided up into a number of members. The diverse fauna of the Chichinales Formation, including a variety of turtles and birds, also includes many mammals such as South American native ungulates (notoungulates and litopterns) as well as armadillos, and caviomorph rodents.
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