Ancient Timber (IMAGE) Columbia Climate School Caption Cross section of a rib made of white oak (more specifically, a first futtock). This sample had 156 rings; its last ring was dated 1845. Holes in upper part were made by wood-eating marine worms. 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.