Campanario Formation () 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. References Geologic formations of Chile Geologic formations of Argentina Miocene Series of South America Pliocene Series of South America Neogene Argentina Neogene Chile Tuff formations Geology of Biobío Region Geology of Maule Region Geology of Neuquén Province