Younger volcanism on display near Dubois, Wyoming

(A) View from Dubois, Wyoming, in the Wind River Basin looking northwest toward Lava Mountain. The yellow line is the approximate boundary between Lava Mountain eruptive units (above line) and older Eocene (34-56 million years old) rocks. (B) Close-up view of Lava Mountain illustrating the capping scoria cone at the summit and the underlying lava units. These show the volcano underwent at least two volcanism phases – effusive and then explosive.

Brett French

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week’s contribution is from Matt Brueseke, professor in the Department of Geology at Kansas State University.

Many of us who visit Yellowstone and Grand Teton national parks drive through (and stay in) Dubois, Wyoming, on U.S. Highway 26/287. Given the ongoing impacts from the June 2022 flooding in Yellowstone, it is likely that even more people than in a typical summer drove this route.

The highway cuts through the Wind River Basin west of Dubois and passes just north of Lava Mountain, which looms above the road. Lava

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