Members of a field team examine an outcrop of rock layers in Grotto Creek in Alaska's Wrangell–St. Elias National Park in 2019. (IMAGE)

Virginia Tech

Members of a field team examine an outcrop of rock layers in Grotto Creek in Alaska's Wrangell–St. Elias National Park in 2019.

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Members of a field team examine an outcrop of rock layers in Grotto Creek in Alaska's Wrangell–St. Elias National Park in 2019.

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Photo courtesy of Ben Gill.

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Photo courtesy of Ben Gill.

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