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There is usually a margin of error with absolute dating techniques.The two most commonly used are dendrochronology and radiocarbon dating.The results are compared to an established tree-ring sequence for a particular region with consideration to annual fluctuations in rainfall which result in variations in the size of the rings laid down by trees on the outside of their trunks.These variations, given favorable conditions, form a consistent pattern; and sections or cores taken from beams in ruins have been matched to provide a long chronology over large areas.On turn there is a creation local dendroscale, allowing with the greatest possible reliability to date each concrete object.

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Chronometric dating, commonly called absolute dating, gives age in actual years.By comparing a complete series of rings from a tree of known date (for example, one still alive) with a series from an earlier, dead tree overlapping in age, ring patterns from the central layers of the recent tree and the outer of the old may show a correlation which allows the dating, in calendar years, of the older tree.The central rings of this older tree may then be compared with the outer rings or a yet older tree, and so on until the dates reach back into prehistory.In 1859, the German-American Jacob Kuechler (1823–1893) used crossdating to examine oaks (Quercus stellata) in order to study the record of climate in western Texas.During the first half of the 20th century, the astronomer A. Douglass founded the Laboratory of Tree-Ring Research at the University of Arizona.




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