| Cholchol Formation | |
| Type: | Geological formation |
| Period: | Miocene |
| Age: | Middle–Upper Miocene |
| Prilithology: | Claystone, sandstone, tuff, calcarenite, calcirudite |
| Namedfor: | Cholchol |
| Namedby: | Floreal García |
| Year Ts: | 1968 |
| Region: | Araucanía Region |
| Coordinates: | -38°N -72°W |
| Underlies: | Pliocene and Pleistocene alluvial fans and volcaniclastic deposits |
| Overlies: | Bahía Mansa Metamorphic Complex Coastal Batholith of central Chile Mesozoic sediments |
| Thickness: | 150– |
Cholchol Formation (Spanish; Castilian: Formación Cholchol) is a geological formation composed of sediments that were deposited during the Miocene in the Temuco Basin of south–central Chile. The sediments were deposited in a marine environment.[1]