Tree-Ring History (IMAGE) Columbia Climate School Caption Cross section of a hull plank made of yellow pine. Upper panel shows the raw sample; the lower one, after sanding to make tree rings stand out, This sample contained 258 annual rings. Credit Ignacio Mundo Usage Restrictions Credit must be given. License Original 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.