Fossil Ammonite (IMAGE) Ruhr-University Bochum Caption Using high-resolution X-ray radiation, Bochum-based researchers study extinct marine creatures. Depicted here is a fossil ammonite. Credit RUBIN, image: René Hoffmann Usage Restrictions Copyright notice has to be included. 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.