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USGS geologist collects a sample from a potential newly recognized lava flow along the Gibbon River, Yellowstone National Park

By Yellowstone Volcano Observatory September 2025 (approx.)
Rock outcrop in the midst of a forest with a person standing on top collecting a sample
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Detailed Description

USGS geologist Mark Stelten collects a sample of what is potentially a newly recognized lava flow exposed along the Gibbon River. USGS photo by Nicole Thomas, September 2025.

Sources/Usage

Public Domain.

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