Twelve Dust Layers in a Study Plot (IMAGE) U.S. National Science Foundation Caption These are twelve dust layers in a study plot in Colorado's Senator Beck Basin Study Area. Credit Center for Snow and Avalanche Studies 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.