Researcher Francisca Diaz (IMAGE) Syracuse University Caption Researcher Francisca Diaz, a co-author on the study, sampling middens in the Atacama Desert in South America. Credit Syracuse University Usage Restrictions None 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.