Devils Thumb

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Named for the protruding natural hot spring cone, this rock's grayish appearance is in stark contrast to the bright orange travertine terraces it rises out of. The water flows in a crisscross pattern, surrounding the protrusion and adding mineral deposits around it. Devil's Thumb is a very short walk from the Lower Terrace Trailhead parking lot off of Grand Loop Rd. There's a boardwalk for your safety and for the preservation of the park.