Outline of Yellowstone tuff, Yellowstone National Park, Wyoming. n.d.
Summary
Album caption and index card: Outline of original extent of the Yellowstone tuff (ash-flow tuff) that covered most of Yellowstone National Park about 600,000 years ago. Yellowstone National Park, Wyoming. n.d.
Summary
Album caption and index card: Outline of original extent of the Yellowstone tuff (ash-flow tuff) that covered most of Yellowstone National Park about 600,000 years ago. Yellowstone National Park, Wyoming. n.d.
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Available in the U.S. Geological Survey, Denver Library Photographic Collection, Stacy, J.R. Collection.
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