Illustration (IMAGE) University of Bonn Caption 200 million year old deposits of the precursor of the Mediterranean Sea have been preserved in the Swiss High Alps. Whale-sized ichthyosaurs came from the open sea only occasionally into shallower water. Credit © Jeannette Rüegg/Heinz Furrer, University of Zurich Usage Restrictions Please use this picture only in connection with the press release. 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.