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The ski area is located on the north side of Mammoth Mountain in the volcanic Long Valley Caldera. Overnight guests stay in the town of Mammoth Lakes, California and occasionally in neighboring towns such as Bishop and June Lake. June Lake's ski area is also owned by Mammoth Mountain Ski Area.
About 100,000 years ago, the most recent of these eruptions formed the Mammoth Knolls, low hills just north of the Town of Mammoth Lakes. Mammoth Mountain, a young volcano on the rim of Long Valley Caldera, was built by numerous eruptions between 220,000 and 50,000 years ago.Volcanoes in the Mono-Inyo Craters volcanic chain, which extends from just south of Mammoth Mountain to the north shore of Mono Lake, have erupted often over the past 40,000 years.During the last 5,000 years, an eruption has broken out somewhere along this chain every 250 to 700 years.he Inyo Craters and nearby lava domes were formed by a series of small to moderate eruptions 550 to 600 years ago, and the most recent eruptions along the volcanic chain took place about 250 years ago at Paoha Island in Mono Lake.