Sliding Boulder (image) University of Chicago Press Journals Caption This image shows year-to-year movement of a large boulder on the Aran Islands off the coast of Ireland. Skid marks can be seen where this rock was recently pushed inland by storm waves. Credit The Journal of Geology/University of Chicago Press Usage Restrictions None 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.