Subglacial precipitate (IMAGE) University of California - Santa Cruz Caption A subglacial precipitate from from the Pensacola basin that formed 200,000 years ago. Combined with data from other samples, the age and uranium isotopic composition of this sample suggests that parts of the East Antarctic ice sheet were deglaciated during a warm interglacial period about 400,000 years ago. Credit Michael Scudder Usage Restrictions For use only with news coverage of this research 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.