Eagle Ford Test Well Drilling in Texas (IMAGE) U.S. Geological Survey Caption USGS researchers drill a research well located on the south side of U.S. 90, 7.1 miles east of Brackettville, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The borehole, core, and logging suite are the third in a series of wells in the Austin -- Eagle Ford for use in our USGS Energy Program regional oil and gas assessments. Credit Stan Paxton, USGS Usage Restrictions Public Domain, please credit: USGS License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.