yellowstone_ashfall

By On April 22, 2011 · Leave a Comment
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Parts of the U.S. once covered by ash from Yellowstone eruptions of 2 million and 630,000 years ago, compared to 760,000-year-old Long Valley caldera eruptions at Mammoth Lakes, CA, and 1980 eruption of Mount St. Helens, WA. (Adapted from Sarna-Wojcicki, 1991.)

 
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