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USGS Technicians Prepare to Take a Core of the Austin Chalk in Texas

By Communications and Publishing
Image shows three men in safety equipment standing next to a drill rig
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Detailed Description

USGS technicians at the USGS Gulf Coast #4 Bonham borehole in preparation for geophysical logging of the Austin Chalk Group and the Eagle Ford Group mudstones, Fannin County, Texas.

Sources/Usage

Public Domain.