Glaciers have played an important role in modifying the landscape of the Long Valley area before, during, and after the enormous caldera-forming eruption 760,000 years ago.
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Glacial striations, moraine deposits beneath the town of Mammoth Lakes and in major river valleys, jagged cirques, and ice-rafted boulders scattered on ancient shorelines of the large lake that once filled the caldera are clear evidence that several episodes of recent glaciationoccurred here.