Mammoth Lakes Basin
Overview
The Mammoth Lakes Basin showcases the powerful glacial and volcanic forces that shaped the Mammoth Lakes area. Its chain of lakes include Twin Lakes, Lake Mary, Lake Mamie, Lake George, and Horseshoe Lake. These lakes occupy a series of glacially carved valleys with Crystal Crag, a jagged quartz-rich buttress, rising above. The basin's granitic bedrock crystallized deep underground roughly 90-100 million years ago. During the Pleistocene Epoch, glaciers gouged out the lake basins, sharpened Crystal Crag into its dramatic form, and retreated only about 10,000 years ago, leaving behind one of the areas most compact and accessible geological showcases.
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