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Palette Spring and Devil’s Thumb (1991)

Detail of Palette Spring, a travertine formation in the Mammoth Hot Springs area of Yellowstone National Park. The “paints” dripping down the formation are actually thermophilic bacteria nourished by hot water that deposits dissolved limestone as it flows downhill. The gray mound to the left of the “palette” is an extinct hot spring called the Devil’s Thumb.


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