Tree ring dating definition

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Tree ring - definition of tree ring by The Free Dictionary

The width of tree rings varies with, among other things, temperature. They can be used to estimate temperature for times before thermometers were in widespread use. When cross sections are taken of trees there is a pattern of annular rings. The width of these rings is, in part, a function of temperature.
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Dating Techniques

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 dendroclimatology , the 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 dating , which always produces a range rather than an exact date. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment most prominently climate and also in wood found in archaeology or works of art and architecture, such as old panel paintings.
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Paleoclimatology in British spelling , palaeoclimatology is the study of climates for which direct measurements were not taken. Paleoclimatology uses a variety of proxy methods from Earth and life sciences to obtain data previously preserved within rocks , sediments , boreholes , ice sheets , tree rings , corals , shells , and microfossils. Combined with techniques to date the proxies, these paleoclimate records are used to determine the past states of Earth's atmosphere.
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