Cerro Pantojo is an extinct

basaltic Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron ( mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90% ...

stratovolcano A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with ...

on the border of

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

and

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

. It lies immediately south of

Cardenal Antonio Samoré Pass Cardenal Antonio Samoré Pass () is one of the main mountain passes through the southern Andes along the border between Argentina and Chile. Together with Paso Libertadores, it is one of the easiest of the Argentina-Chile passes, and one of the ...

and its characteristic spire-shaped summit is an eroded

volcanic plug A volcanic plug, also called a volcanic neck or lava neck, is a volcano, volcanic object created when magma hardens within a Volcanic vent, vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if risi ...

. It also has flank lava flows.

References

* * Stratovolcanoes of Chile Andean Volcanic Belt Volcanic plugs of South America Mountains of Argentina Mountains of Los Lagos Region Nahuel Huapi National Park Volcanoes of Los Lagos Region Volcanoes of Neuquén Province Polygenetic volcanoes Extinct volcanoes Pleistocene stratovolcanoes Quaternary South America Two-thousanders of the Andes {{LosLagos-geo-stub

See also

References