Sedimentary Rocks of the Grand Canyon (IMAGE) U.S. National Science Foundation Caption These are sedimentary rocks of the Grand Canyon. This rock type contains high levels of nitrogen. Credit Scott Morford 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.