Powars II excavation (IMAGE) University of Wyoming Caption University of Wyoming Ph.D. student Chase Mahan inspects an artifact from excavation at the Powars II archaeological site in 2020. Credit Spencer Pelton 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.