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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 Madera and Mono Counties.〔 It is home to a large ski area on the Mono County side. 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 caused ski patroller fatalities in 2006.〔 ==Geology== Mammoth Mountain is a lava dome complex in Mono County, California. It lies in the southwestern corner of the Long Valley Caldera〔 and consists of about 12 rhyodacite and dacite overlapping domes.〔 These domes formed in a long series of eruptions from 110,000 to 57,000 years ago, building a volcano that reaches in elevation.〔 During this time, massive dacite eruptions occurred roughly every 5000 years.〔 The volcano is still active with minor eruptions, the largest of which was a minor phreatic (steam) eruption 700 years ago.〔 Mammoth Mountain also lies on the South end of the Mono-Inyo chain of volcanic craters.〔 The magma source for Mammoth Mountain is distinct from both the Long Valley Caldera and the Inyo Craters.〔〔 Mammoth Mountain is composed primarily of dacite and rhyolite,〔 some of which have been altered by hydrothermal activity from fumaroles (steam vents). File:Mammoth Mountain Ski Area in summer-1200px.jpg|Mammoth Mountain from the north (Minaret Summit) File:TreeKill.jpg|Carbon dioxide has killed a large area of trees File:Ritter Range and Mammoth Mountain.jpg|Mammoth Mountain from the south, with Ritter Range behind 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mammoth Mountain」の詳細全文を読む スポンサード リンク
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