Geomorphic Map, Great Barrier Reef (IMAGE) Arizona State University Caption Geomorphic maps communicate the seascape or structure of the ocean floor. There are a total of 12 geomorphic classes identified on the Allen Coral Atlas. Credit Allen Coral Atlas Usage Restrictions Use with photo credit. License Original 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.