sign for devils thumb hot spring mineral formation yellowstone national park |
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| navigate by keyword : abstract backgrounds calcium carbonate close colorful devils ecology environment famous geology geothermal geyser heat hot landscape limestone mammoth mineral mountain national natural nature orange outdoors park scenery scenic sign spring springs terrace thermal thumb travel travertine usa volcanic volcano water wilderness wyoming yellowstone |
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| Sign for Devils Thumb, a hot spring mineral formation in Yellowstone National Park. |
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