Abatan River (IMAGE) University of Massachusetts Amherst Caption The river bedrock is shaped by large holes bored by the shipworm. Credit Marvin Altamia and Reuben Shipway 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.