Tree-ring dating

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Tree ring dating dendrochronology has been used in an attempt to extend the calibration of carbon dating earlier than historical records allow. The oldest living trees, such as the Bristlecone Pines Pinus longaeva of the White Mountains of Eastern California, were dated in by counting tree rings at 4, years old. This would mean they pre-dated the Flood which occurred around 4, years ago, taking a straightforward approach to Biblical chronology.

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Dating of archaeological timbers. Dating of period buildings. Dendrochronology or tree-ring dating is the scientific method of dating using the annual nature of tree growth in suitable tree species.

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Dendrochronology is a science of precise dating, by the accurate counting of annual tree growth-rings, which allows dating wooden items to the year. The pattern of annual tree-rings differs each year, depending upon the growing conditions at the time. Dendrochronology uses the variations in the thickness of annual growth rings in living trees as well as old timbers to date wooden objects and buildings, by counting tree-rings back from the present on very old trees and then by successively overlapping even older timbers further back through time.

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Until relatively recently, radiocarbon dating of wooden objects was the only known scientific method of dating wooden objects. Although in general it was always successful, dated produced would have a range of plus or minus 20 years at best, and at worst could span two centuries or more. And this only dated the actual rings sampled for C14 analysis; the tree may well have continued to live for decades or even a century or more afterwards. The potential of this in studying the development of timber-framing was quickly realised by one of the early pioneers of the science, Dr John Fletcher, who began to investigate the medieval buildings of the Oxford region between and

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The annual growth rings of long-lived trees, such as sequoias, bristlecone pines, and European oaks, whose wood was used for beams, posts, and other purposes can be used to date sites. Seasonal conditions affect annual tree growth, causing all trees of the same species within a given geographical region to have the same tree-ring pattern. Cross sections of cut or dead trees from a single region are compared and the tree-ring patterns are matched.

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Dendrochronology is the formal term for tree-ring dating, the science that uses the growth rings of trees as a detailed record of climatic change in a region, as well as a way to approximate the date of construction for wooden objects of many types. As archaeological dating techniques go, dendrochronology is extremely precise: if the growth rings in a wooden object are preserved and can be tied into an existing chronology, researchers can determine the precise calendar year—and often season—the tree was cut down to make it. Radiocarbon dates which have been calibrated by comparison to dendrochronological records are designated by abbreviations such as cal BP, or calibrated years before the present.

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Some people claim that tree ring dating can disprove the Bible. They claim trees are older than the date of the worldwide Flood about 4, years ago. However, this conclusion is reached on the assumption that a tree ring always represents one year of growth.

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Several species of trees live almost indefinitely. The giant sequoia trees of California are known to live over 3, years, discerned through tree ring dating. Under normal circumstances, woody trees add one ring per year. A ring typically consists of a light-colored growth portion and a dark-colored portion produced in a stabilization season.

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Wayne's Word. Noteworthy Plants. Biology

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Dendrochronology or tree-ring dating is the scientific method of dating tree rings also called growth rings to the exact year they were formed. As well as dating them this can give data for dendroclimatologythe study of climate and atmospheric conditions during different periods in history from wood. Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon datingwhich always produces a range rather than an exact date, to be very accurate.

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