| Cardiel Formation | |
| Type: | Geological formation |
| Period: | Maastrichtian |
| Age: | Maastrichtian |
| Prilithology: | Sandstone, conglomerate |
| Otherlithology: | Tuff |
| Namedfor: | Lake Cardiel |
| Namedby: | Russo & Flores |
| Year Ts: | 1971 |
| Region: | Santa Cruz Province |
| Country: | Argentina |
| Coordinates: | -49°N -71.4°W |
| Paleocoordinates: | -50.9°N -60.9°W |
| Underlies: | Slogget & San Julián Formations |
| Overlies: | Divisadero & Kachaike Formations |
| Extent: | Austral Basin |
The Cardiel Formation is a Maastrichtian geologic formation of the Austral Basin in Santa Cruz Province, Argentina. The formation comprises sandstones and conglomerates with abundant tuff beds.[1] The formation is overlain by the Slogget and San Julián Formations and overlies the Divisadero and Kachaike Formations.[2] Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.[3]