Terminal Ediacaran Carbonate Rocks (IMAGE) Arizona State University Caption These are Terminal Ediacaran carbonate rocks in Three Gorges area (Hubei Province), People's Republic of China. These rocks were deposited in a shallow marine environment between 551 and 541 million years ago, and hold a record of the marine environmental changes that occurred at the time they were deposited. Credit ASU 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.