Cerro Overo
Cerro Overo is a maar lying at the foot of Chiliques volcano and close to Laguna Lejía, in the Antofagasta Region of northern Chile over ignimbrites of Miocene-Pliocene age. It is the result of a phreatomagmatic eruption, its maximum diameter is and its depth is. The maar formed in postglacial times and erupted basalts that originated in the deep crust, with no magma chamber. The lavas are of lower crustal provenience and are among the least evolved of northern Chile. According to a thesis published in 2017, it formed about 77,000 years ago.
