Dendrochronology radiocarbon dating calibration
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Because radiocarbon is everywhere the same in the atmosphere at any given time, tree rings which grew in the same year should have the same amount of radiocarbon.Generally, it is not possible to construct a complete sequence of tree rings back through the historical periods using only living trees.
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By matching ring-width patterns in a specimen of known age (starting with living specimens) to ring-width patterns in an older specimen, the proper placement of the older specimen is determined.
Tree-ring chronologies have been extended to 10,000 years before present in this way.
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