<i>H. balthica</i> Fossils (IMAGE) Columbia Climate School Caption H. balthica fossils are painstakingly separated from grains of sand and then analyzed by mass spectrometers. Credit (Rudy Diaz, Columbia University) 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.