Yellowstone National Park - Grand Canyon of the Yellowstone
The Upper Falls
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The gorge cut in altered volcanic tuffs
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Volcanic tuff in close up
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Micro geology, macro behind
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Uncle Tom's Trail, across the gorge
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My bearclaw lunch
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Volcanic tuff with black obsidian
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The Lower Falls
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Views of the gorge
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The Lower Falls and the Gorge from Artists point
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