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| Chorrillo Formation | |
|---|---|
| Stratigraphic range: | |
 Satellite image of the Chorrillo Formation site (in the middle on the right). In the bottom left is the Perito Moreno Glacier. | |
| Type | Geological formation |
| Underlies | Calafate Formation |
| Overlies | La Irene Formation |
| Thickness | >50 m (160 ft) |
| Lithology | |
| Primary | Claystone |
| Location | |
| Location | Patagonia |
| Coordinates | 49°54′S 72°30′W / 49.9°S 72.5°W |
| Approximate paleocoordinates | 51°48′S 62°12′W / 51.8°S 62.2°W |
| Region | Santa Cruz Province |
| Country | Argentina |
| Extent | Southeast of Viedma Lake North of Argentino Lake Austral Basin |
| Type section | |
| Named by | Arbe & Hechem |
| Year defined | 1984 |
  Chorrillo Formation (Argentina) | |
The Chorrillo Formation, also named as Chorillo Formation,[1] is a Maastrichtian (Late Cretaceous Epoch, 72.1 - 66 million years ago) geologic formation in southern Patagonia, Argentina. The formation is more than 50 metres (160 ft) thick and underlies the Calafate Formation and rests on top of the La Irene Formation.[2]
- ^ Río Leona at Fossilworks.org
- ^ Marenssi et al., 2003, p.406