The broad edifice covers an area of about and a volume of -. It appears to consist entirely of lava flows and lava domes; while the occurrence of pyroclastic flow deposits was reported at first later research has not found any evidence of explosive eruptions. Aside from volcanic deposits there are also traces of glaciation which has smoothened the slopes of Uturuncu, as well as Pleistocene and Holocene alluvium and colluvium.