Chusmiza complex (also known as Cerros de Sotoca) is a Miocene volcano in Chile. It is the largest stratovolcano of the Miocene in the western Andean escarpment, with a volume 400 cubic kilometres (96 cu mi). It is constructed from andesite. Potassium-argon dating has established an age of 11.3±0.3 mya.
References
Chusmiza Wikipedia(Text) CC BY-SA