Map of the ice stream in Storfjorden (IMAGE) UiT The Arctic University of Norway Caption Map of Storfjorden and Storfjorden Trough with ice-sheet extent at 22,000 years and ice streams indicated. Areas, where the shelf ice and ice streams broke up during atmospheric and ocean warming are marked with whitish colours. (A) Collapse during the first warming phase c. 15,000 years ago. (B) Collapse at the start of the present warm period (intergladial) 11,000 years ago. Black lines marked G4 to G1 are groundings lines where the ice stood still for an extended period of time. Credit Illustration T. Rasmussen/E. Thomsen 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.