Fortress in Dubrovnik (IMAGE) University of Arizona Caption This old fortress in Dubrovnik sits on top of an Eocene thrust fault which is visible in the photo. The newly discovered active thrust fault lies not far offshore. Credit Richard A. Bennett Usage Restrictions This picture may only be used to accompany a story about the research described in this 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.