Collecting core samples (IMAGE) University of Utah Caption Mitchell Power of the Natural History Museum of Utah and co-author of the study, pulls out a freeze corer, a device used to collect lake sediment. Credit Vachel Carter Usage Restrictions Non commercial with attribution. 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.