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When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.Therefore they have sought ways to calibrate and correct the carbon dating method.The best gauge they have found is dendrochronology: the measurement of age by tree rings.
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But when a plant or animal dies, it can no longer accumulate fresh carbon 14, and the supply in the organism at the time of death is gradually depleted.
But it is already clear that the carbon method of dating will have to be recalibrated and corrected in some cases.
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