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% of a ...

stratovolcano on the border of

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

and

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

. It lies immediately south of

Cardenal Antonio Samoré Pass Cardenal Antonio Samoré Pass ( es, Paso Cardenal Antonio Samoré) 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 Arge ...

and its characteristic spire-shaped summit is an eroded

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

. 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 {{LosLagos-geo-stub

See also

References