Sedimentary Rocks of the Grand Canyon (image) National Science Foundation Share Print E-Mail Caption These are sedimentary rocks of the Grand Canyon. This rock type contains high levels of nitrogen. Credit Scott Morford Usage Restrictions None Share Print E-Mail 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.