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.)
Detailed Description
USGS geologists Mark Stelten (pictured) and Nicole Thomas collect 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.