Stripes Along Seafloor (IMAGE) Proceedings of the National Academy of Sciences Caption Stripes along seafloor represent layers of Ordovician limestone exposed at low tide on Anticosti Island. Credit PNAS Usage Restrictions None 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.