| Campanario Formation | |
| Type: | Geological formation |
| Period: | Pliocene |
| Age: | Late Miocene–Early Pliocene |
| Prilithology: | Tuff, breccia, welded tuff, andesite lava, dacite lava |
| Namedby: | Robert E. Drake |
| Year Ts: | 1974 |
| Region: | Maule & Bío Bío Regions Neuquén Province |
| Country: | Chile, Argentina |
| Coordinates: | -36°N -71.6°W |
Campanario Formation (Spanish; Castilian: Formación Campanario) is a Miocene geological formation in the high Andes of Central Chile and northern Neuquén Province in Argentina. The formation crops out around the upper parts of the basins of Maule and Ñuble rivers.[1] [2] [3]