Figure 1 (IMAGE) Science China Press Caption Paleogeographic scenario for the Jiachala Formation. a) Jiachala Formation, b)&c) other trench deposits to the west. Credit ©Science China Press 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.