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25-Jan-2020 16:49

Most of the images here were scanned using the original wood samples.The captions beside the pictures contain terminology used by dendrochronologists when referring to tree-ring characteristics.Following these tree-ring patterns, the sum of which we refer to as chronologies, from living trees back through time, we can thus compare wood from old or ancient structures to our known chronologies, match the ring patterns (a technique we call cross-dating), and determine precisely the age of the wood used by the ancient builder. Please see our procedures page for details of the basic dendrochronology procedures used in the Cornell Tree-Ring Laboratory.

These patterns can be compared and matched ring for ring with trees growing in the same geographical zone and under similar climatic conditions. Douglass working in the American Southwest, and has since been applied in many areas of the world.These Web pages were created to be used by both teachers and students interested in learning more about dendrochronology, the study of tree rings.