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Geologic Trip, Mammoth Area Mammoth Mountain Mammoth Mountain is a
volcano that lies along the southwestern rim of the Long Valley Caldera. The
volcano began to take shape 200,000 years ago and was built up over the next
160,000 years by a series of a dozen or so eruptions of rhyolite and andesite
interspersed with layers of tuff, scoria, and pumice. The last of these
eruptions was about 40,000 years ago. The
volcano is still active and new eruptions could occur some time in the future. Exterior Websites USGS: _____ |