Year Bands (IMAGE) Bigelow Laboratory for Ocean Sciences Caption A polished cross-section of Clathromorphum nereostratum's skeleton, which contains "year bands" akin to tree rings. Such year bands were used to reconstruct the history of urchin grazing in the ecosystem. Credit D. Rasher Usage Restrictions Credit required 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.