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In the American Southwest, the unbroken sequence extends back to 322 B. So, when an archaeologist finds a well-preserved piece of wood—say, a roof beam from an ancient pithouse—dendrochronologists prepare a cross section and then match the annual growth rings of the specimen to those in the already-established chronology to determine the year the tree was cut down. (Article available on the Indiana State University website.) The Laboratory of Tree-Ring Research in Tucson is the world's oldest dendrochronology lab; their website includes information for researchers and the general public.The Science of Tree Rings is an educational website with lots of information—from basic definitions and principles to links to tree-ring databases and other resources.

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Of the numerous definitions describing the essence of dendrochronology, here at the Cornell Tree-Ring Laboratory, we adhere to Eckstein's definition: "dendrochronology is a science of extracting chronological and non-chronological information from dated tree-rings." The key to dendrochronology and related sciences is tree-ring growth.

Tree-rings are easy to observe in the cross-section of most sawn tree trunks.

Each ring is one of the many concentric bands surrounding the pith and all are more or less distinguishable from each other.

As soil water declines through the summer, the cells become thicker-walled and more dense.

Thus each annual ring consists of early (light) and late (dark) wood. Douglass, the 'father' of dendrochronology was interested in the affect of sunspots on the earth’s climate.




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