Clovis Excavation Sites (IMAGE) University of South Carolina Caption University of South Carolina archaeologists found an abundance of platinum -- an element associated with cosmic objects like asteroids or comet -- at 11 Clovis excavation sites across the United States. Credit South Carolina Institute for Archaeology and Anthropology, University of South Carolina 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.