Navajo Sandstone (IMAGE) Geological Society of America Caption Navajo Sandstone from the Moab area taken by study co-author Stephen T. Hasiotis. Credit Stephen T. Hasiotis Usage Restrictions Credit Stephen T. Hasiotis 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.