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These Web pages were created to be used by both teachers and students interested in learning more about dendrochronology, the study of tree rings.You can use the information here to supplement a lesson plan or to expand your basic knowledge of dendrochronology principles.These pages are divided into several major categories that should answer some of the more common questions regarding dendrochronology.These include a page that explains in detail the basic principle of crossdating, a page that illustrates some basic applications of dendrochronology, and two pages that show photographs of tree species suitable and unsuitable for tree-ring dating.Use that office closet for more than storing old yearbooks.Tree Ring eliminates waste by only printing as many books as ordered, but we also go one step further: we plant a tree for every yearbook sold.Matching the pattern in trees whose age is known to the pattern in wood found at an archaeological site can establish the age at which the wood was cut and thus the approximate date of the site.

The study of growth rings in trees for the purpose of analyzing past climate conditions or determining the dates of past events.Because trees grow more slowly in periods of drought or other environmental stress than they do under more favorable conditions, the size of the rings they produce varies.Analyzing the pattern of a tree's rings provides information about the environmental changes that took place during the period in which it was growing.Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.Absolute dating provides a numerical age or range in contrast with relative dating which places events in order without any measure of the age between events.

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