Dendrochronology

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Dendrochronology is a method of scientific dating which is based on annual tree growth patterns called tree rings. The rings are the result of changes in the tree's growth speed over the year (since trees grow faster in the summer and slower in the winter). The age of a tree can be found by counting the rings and is the only method on this list that can date events precisely to a single year.

Now, any date derived from one individual tree is not in itself contradictory to the recent creation doctrine, since even the longest lived types of tree do not live longer than 5,000 years or so. However, it is possible to extend the chronology back over many different trees. Because the thickness of tree rings varies with the climate, a sequence of thick ring, thin ring, thin ring, thick ring, thick ring, thick ring, thin ring, thick ring is strong evidence that the corresponding rings formed at the same time. By observing and analyzing the rings of many different trees from the same area, including fossil trees, the tree ring chronology has been pushed back in some areas as far as 11,000 years1.(2)

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