Valeska Decker (IMAGE) University of Bonn Caption Valeska Decker and her colleagues investigated a number of sediment profiles for the study. These make it possible, for example, to draw conclusions about sea-level changes. Credit © Valeska Decker/University of Bonn Usage Restrictions Please use this image only in connection with the press release. 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.