Cerro Tumisa

Tumisa (also known as ) is a Pleistocene stratovolcano in the Andes. Located east of the Salar de Atacama, it is part of the Central Volcanic Zone, which since the Miocene has been subject to extensive andesitic/dacitic effusive activity and ignimbrite eruptions. The basement on which Tumisa is built includes Paleozoic rocks and more recent volcanic products of the Lejia volcano and the Atana and Patao ignimbrites.

Block flows, lava flows, lava domes and some ignimbrites of pumiceous composition form this composite volcano. More than six lava domes and two major cones are part of this system and surrounded by a pyroclastic apron, which covers a surface area of and is formed from many pyroclastic flows with a total volume of . The pyroclastic flows contain pumice and large blocks, some of which show signs of deformation when they were still hot. The lava domes and lavas are grouped in three units. Presumably, the activity of Tumisa started with explosive eruptions that generated the ignimbrite apron, later degassed magma formed the lava domes and lava flows.