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What's Under Yellowstone?
What's Under Yellowstone?
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ancient ash
Picture: Robert L. Christiansen/USGS |

The cliffs around the rim of Mount Everts in the northern part of Yellowstone National Park are composed of the ancient ash and ejecta produced by both the 2.1-million-year-old Huckleberry Ridge eruption, and the 640,000-year-old Lava Creek eruptions.


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Picture: Robert L. Christiansen/USGS |

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