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Orange Spring Mound, Mammoth Hot Springs, Yellowstone National Park, Wyoming | by Thad Roan - Bridgepix
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Orange Spring Mound, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Orange Spring Mound: Water flows from several vents at the top of this formation, slowly consuming the surrounding trees with deposited minerals. The vibrant orange colors are due to heat-tolerant bacteria. (Yellowstone Expedition Guide)

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Taken on September 16, 2006