Isabel Barton 3 (IMAGE) University of Arizona College of Engineering Caption Examining sandstone compositions with a handheld X-ray fluorescence spectrometer outside of Moab, Utah. Credit Isabel Barton 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.