Mount Mazama, a destroyed stratovolcano in Oregon whose caldera contains Crater Lake
Much of what is known of Mazama's geology comes from a study by Howel Williams of the University of California, Berkeley and later, from USGS geologist Charles R. Bacon who expanded and modified Williams' work.
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It was created by a massive explosive eruption of Mount Mazama about 6,800 years ago, during which it collapsed to create the caldera of Crater Lake.