Sediment Sampling (IMAGE) University of Wyoming Caption University of Wyoming undergraduate students work with Bryan Shuman (in small boat), a UW professor of geology and geophysics, to collect sediment core samples from the bottom of small lakes in the northeast United States as part of a study of ancient droughts. Pictured, from left, are Nicolas Mores (wearing hat), Ryan Davis, John Calder (a Ph.D. student) and Sara Burrell. Credit Marc Serravezza 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.