Grand Caillou Mound May 2018 (IMAGE) Vanderbilt University Caption The Grand Caillou Mound in the Mississippi River Delta may have been abandoned due to environmental stress. Credit Jayur Mehta Usage Restrictions None 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.