http://bit.ly/1zfNXza Mammoth Mountain is a lava dome complex in the southwestern corner of the caldera, consisting of about 12 rhyodacite and dacite overlapping domes.[2][3] 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.[4] http://on.doi.gov/1vgqs8u http://bit.ly/1pkcsVq
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