How acurate is radom carbon dating
The more ancient part of the chronology was constructed from oak logs preserved in peat beds, for example.
The European oak chronology provided an excellent check of the American dendrochronologies. Ring-width patterns are determined by local environmental factors, such as temperature and rainfall.
Furthermore, radiocarbon in the atmosphere fluctuates from year to year in a somewhat erratic fashion.Generally, it is not possible to construct a complete sequence of tree rings back through the historical periods using only living trees.Chronologies derived from living trees must be extended.However, they did agree with the bristlecone chronology as far back as it could be checked by the shorter chronologies.That is, rings of the same putative dendrochronological age were found to contain the same amount of radiocarbon, and to give the same pattern of fluctuations over time.