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Exposure of rhyolite volcanic rocks in the central Snake River Plain

By Yellowstone Volcano Observatory May 2004 (approx.)
Exposure of rhyolite volcanic rocks in the central Snake River Plain
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Detailed Description

Exposure of rhyolite volcanic rocks in the central Snake River Plain showing a thick sequence of 10-12 million-year-old, densely welded, pyroclastic density flow units (darker units from middle of photo to top of hill) overlying a thick sequence of white, friable, ash fall deposits.  USGS Photo by L. A. Morgan (May 2004).

Sources/Usage

Public Domain.