![]() ![]() ![]() The magma source for Mammoth Mountain is distinct from those of both the Long Valley Caldera and the Inyo Craters. Mammoth Mountain also lies on the south end of the Mono-Inyo chain of volcanic craters. The volcano is still active with minor eruptions, the largest of which was a minor phreatic (steam) eruption 700 years ago. During this time, massive dacite eruptions occurred roughly every 5000 years. These domes formed in a long series of eruptions from 110,000 to 57,000 years ago, building a volcano that reaches 11,059 feet (3,371 m) in elevation. It lies in the southwestern corner of the Long Valley Caldera and consists of about 12 rhyodacite and dacite overlapping domes. Mammoth Mountain is a lava dome complex in Mono County, California. Mammoth still produces hazardous volcanic gases that kill trees and caused ski patroller fatalities in 2006. Mammoth Mountain was formed in a series of eruptions that ended 57,000 years ago. It is home to a large ski area primarily on the Mono County side. Mammoth Mountain is a lava dome complex partially located within the town of Mammoth Lakes, California, in the Inyo National Forest of Madera and Mono Counties. Mammoth Mountain (the United States) Show map of the United States ![]()
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