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It is also used as a check in radiocarbon dating to calibrate radiocarbon ages.New growth in trees occurs in a layer of cells near the bark.A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings.Each ring marks a complete cycle of seasons, or one year, in the tree's life.

When one can match these tree-ring patterns across successive trees in the same locale, in overlapping fashion, chronologies can be built up—both for entire geographical regions and for sub-regions.

For instance, missing rings are rare in oak and elm trees.

Critical to the science, trees from the same region tend to develop the same patterns of ring widths for a given period of chronological study.

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Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed.

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