Radiocarbon dating of the dead sea scrolls dating gr
The following article is abstracted from The Biblical Chronologist Volume 5, Number 1. The science of constructing chronologies from tree rings is called dendrochronology. Modern trees are known to produce one growth ring per year. (The idea that ancient trees grew more than one ring per year will be discussed below.) Therefore, by coring a living tree and counting rings from the present backwards, it is possible to determine the year in which each ring grew. The bristlecone pines in the White Mountains of California live to extremely old ages, some in excess of 4,000 years.The University of Arizona dendrochronology lab sports a (no longer living) specimen which contains over 6,000 rings.None of these things are true of the oaks used in the European chronology.They are deciduous, grow relatively rapidly, at low altitudes, in relatively warm, moist environments, and live for only hundreds of years.The pattern of radiocarbon in the rings showed a maximum divergence, even at very old ages, of only around 40 years.This objective, quantitative test of dendrochronology showed it to be reliable and accurate.This allows different dendrochronologies to be compared over multiple years to see if they show the same pattern of radiocarbon fluctuations.
But another independent check came along which was even better than the Douglas fir chronology.
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.
This is accomplished using wood specimens found preserved, for example, in historic buildings, or on the forest floor, or in peat bogs.
The rings in a non-living specimen can be counted to determine the number of years the specimen spans.
Separate dendrochronologies were then developed, also in America, using other types of trees, such as Douglas fir.