Surf clam (IMAGE) Louisiana State University Caption Archaeologists have discovered a way to reconstruct past climates by analyzing the shells of this species of short-lived surf clams, Donax obesulus, which have been consumed by people since ancient times. Credit Jacob Warner, LSU Usage Restrictions N/A License Original 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.