Ice Core (IMAGE) University of New South Wales Caption Fine layers of ancient volcanic ash in the ice helped the team pinpoint when the mass melting took place. Credit AntarcticScience.com Usage Restrictions Please credit: AntarcticScience.com 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.