English: This image shows volcaniclastic conglomerate of the Washburn Group along the Mount Washburn Trail, Yellowstone National Park, USA. The Washburn Group is part of the Absaroka Volcanic Supergroup, which underlies most of the northeastern and eastern parts of the park and, with an age of around 50 million years, long predates the Yellowstone calderas.
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Captions
Volcaniclastic conglomerate of the Washburn Group, Yellowstone National Park, USA