Ice Core (IMAGE) University of Washington Caption Close-up of an ice core from Antarctica with a darker layer of volcanic ash. The UW group is now analyzing these samples to see if they show the same trend as the Greenland cores. Credit Mark Stone/University of Washington Usage Restrictions With credit 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.