Tree Rings (IMAGE) University of Missouri-Columbia Caption Past fire years are detected on trees as injuries that can be dated to the exact year using tree-ring dating methods. Shown here are fire years recorded by a single tree in central Pennsylvania. Credit Michael Stambaugh, MU College of Agriculture, Food and Natural Resources 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.