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CalVO geologists take paleomag samples from a basaltic andesite lava flow on Ash Creek Butte

September 2020 (approx.)

Detailed Description

Andy Calvert and Tony Pivarunas drill into the face of a lava flow on Ash Creek Butte, a Pleistocene shield volcano northeast of Mount Shasta. USGS photo by Dawnika Blatter


Public Domain.