Giant Sequoia Cross-Section (IMAGE) University of Arizona Caption This cross-section of a giant sequoia tree shows some of the tree-rings and fire scars. The numbers indicate the year that a particular ring was laid down by the tree. Credit Tom Swetnam. Usage Restrictions This photo, Giant Sequoia Cross-Section, may only be used to illustrate a story about the research described in the accompanying news release, Giant Sequoias Yield Longest Fire History from Tree Rings. Please make sure to credit the photo as indicated. Do not post this photo independent of the story. 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.