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A geologist stands on the south rim of the explosion crater atop Deer Mountain. The rim consists of fragmented volcanic rocks erupted by a series of steam explosions from the top of the mountain; note the large blocks exposed on the deeply eroded surface of the south flank. This layer of debris is beneath the deposits erupted from the Inyo Craters, located about 400 m to the south, which indicates that the series of steam explosions began at Deer Mountain, then moved to the south. Deer Mountain is a lava dome of rhyolite composition that was erupted in the west side of Long Valley Caldera about 115,000 years ago. |
