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 formation geology geothermal geyser heat hot landscape limestone macro mammoth mineral minerva mountain national natural nature orange outdoors park rock scenery scenic sign spring springs terrace thermal thumb travel travertine usa volcanic volcano water wilderness wyoming yellowstone |
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| Devils Thumb, a hot spring mineral formation in Yellowstone National Park. |
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