YVO Photogallery, Mesa Falls ash-flow tuff

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Photographs of Mesa Falls ash-flow tuff, Yellowstone National Park

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Mesa Falls ash-flow tuff, Yellowstone National Park, Wyoming

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Mesa Falls ash-flow tuff and underlying fallout ash exposed in a quarry near Ashton, Idaho. This area was near the depositional margin of the ash flows and consequently the ash-flow tuff is nonwelded and contained abundant large pumice blocks. The tuff was deposited during a large eruption that produced the Henrys Fork caldera southwest of Yellowstone National Park 1.2 million years ago. Photograph by Dan Dzurisin.

Mesa Falls ash-flow tuff, Yellowstone National Park, Wyoming

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Closer view of Mesa Falls ash-flow tuff and underlying fallout ash exposed in a quarry near Ashton, Idaho. Photograph by Robert L. Christiansen in July 1983.

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