Archaeological site, Caylán (IMAGE) Louisiana State University Caption Archaeological site, Caylán, in the Nepeña Valley, Peru, where these surf clams used to reconstruct past climate are found as mittens. Credit Jacob Warner, LSU Usage Restrictions NA 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.