Ice Wedge (IMAGE) Hokkaido University Caption A section of an ice wedge extracted from the northern Alaskan tundra is providing insight on the region's geological history. Credit Yoshinori Iizuka, Hokkaido University. Usage Restrictions This image is copyrighted and can be used for reporting this press release if properly credited. 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.