Shells (IMAGE) University at Buffalo Caption These are shells from Greenland. By dating fossils like these, scientists have come up with a new technique for determining when glaciers were smaller than they are today. Credit Jason Briner Usage Restrictions This image may only be used in conjunction with news stories covering the research in the associated press release. 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.