Facts about tree ring dating

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The study of tree rings is called dendrochronology.

It’s important to remember that we have limited data, and new discoveries have often overturned previous ‘hard facts’.This is a cross-section of a Douglas-fir (Pseudotsuga menziesii) from the Catalina Mountains north of Tucson, Arizona.The sample shows excellent ring-width variability from one ring to the next.It is also used in radiocarbon dating to calibrate radiocarbon ages.New growth in trees occurs in a layer of cells near the bark.

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