Location of Barnett Shale and Study Area (image) University of Texas at Austin Caption This is a Texas map showing the Barnett Shale (gray) and rectangle indicating region featured in accompanying map of earthquakes and injection wells. Credit Cliff Frohlich/U. of Texas at Austin. Usage Restrictions None 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.