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La Garita Mountain (elevation 4179 m [13711 ft]), Colorado

Detailed Description

La Garita Mountain (elevation 4179 m [13711 ft]), Colorado.  The mountain is a resurgent block of Fish Canyon Tuff that is more than 1 km (0.6 mi) thick—the top is eroded and the base is not exposed.  The tuff formed during the eruption of La Garita caldera about 27.8 million years ago and has a volume of more than 5000 km3 (1200 mi3)—one of the largest eruptions known on Earth.  USGS photo by Peter Lipman, 1986.


Public Domain.