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Mammoth Mountain is a lava dome complex west of the town of Mammoth Lakes, California in the Inyo National Forest of Mono County.[3] It is home to a large ski area.Mammoth Mountain was formed in a series of eruptions that ended 57,000 years ago. However, Mammoth still produces hazardous volcanic gases that kill trees and have caused ski patroller fatalities in 2006.
Source: Mammoth Mountain - Wikipedia
