valley (IMAGE) Rice University Caption The Rio Madre de Dios basin is rife with carbon-rich shales, the ideal rock type to study for the purposes of the project. Credit (Photo courtesy of Mark Torres/Rice University) Usage Restrictions Must credit Mark Torres/Rice University. License Original 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.