Periodic Bedrock Ridges on Mars (IMAGE) University of Washington Caption Images from the High Resolution Imaging Science Experiment on NASA's Mars Reconnaissance Orbiter show exposed rock strata in periodic bedrock ridges on the floor of the West Candor Chasma on Mars. Credit NASA Usage Restrictions News use only 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.