Sliding in the Laurentide Ice Sheet (IMAGE) University of Oregon Caption Illustration shows areas in North America's Laurentide Ice Sheet where there is evidence for weak, strong and no evidence for glacial sliding, based on research by earth scientists at the University of Oregon. Credit Anthony S. Downey Usage Restrictions Use credit 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.