Ymer Island (IMAGE) Indiana University Caption Scientists collect rock samples on Ymer Island in eastern Greenland, one of several sites whose analysis provided insight into the chemical makeup of lake beds in the Devonian Period. Credit John Marshall, University of Southampton. Usage Restrictions Credit source 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.