Glass Mountain, in Inyo National Forest, is a peak in Mono County, California. The peak lies southeast of the shoreline of Mono Lake and is the highest point on the long sinuous Glass Mountain Ridge.Glass Mountain, California–Nevada, 15 Minute Topographic Quadrangle, USGS, 1962Casa Diablo Mtn., California, 15 Minute Topographic Quadrangle, USGS, 1953Cowtrack Mtn, California, 15 Minute Topographic Quadrangle, USGS, 1962
The Glass Mountain Ridge forms the northeast boundary of Long Valley Caldera. It consists of a sequence of lava domes, flows, and welded pyroclastic flows of rhyolite composition that were erupted between 2.1 and 0.8 million years ago. Obsidian, a naturally occurring volcanic glass, can be found on the mountain.
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