Los Rastros Formation
| Los Rastros Formation | |
|---|---|
| Stratigraphic range: Carnian | |
| Type | Geological formation |
| Unit of | Agua de la Peña Group |
| Underlies | Ischigualasto Formation |
| Overlies | Chañares Formation |
| Thickness | Up to 1,000 m (3,300 ft) |
| Lithology | |
| Primary | Claystone, sandstone |
| Other | Mudstone |
| Location | |
| Coordinates | 29°06′S 69°06′W / 29.1°S 69.1°W |
| Approximate paleocoordinates | 45°48′S 34°54′W / 45.8°S 34.9°W |
| Region | La Rioja Province San Juan Province |
| Country | Argentina |
| Extent | Ischigualasto-Villa Unión Basin |
The Los Rastros Formation is a mid-Carnian fossiliferous formation of the Agua de la Peña Group, in the Ischigualasto-Villa Unión Basin of northwestern Argentina. Fossil archosaur tracks, as well as many insects, fish, bivalves, crustaceans and plants have been reported from the formation.