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California tree ring dating

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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. Tree-ring dating works because a tree grows larger—not just height but gains girth—in measurable rings each year in its lifetime.
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California tree ring dating
California tree ring dating
California tree ring dating
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Tree-Ring Services - dendrochronology applied to date Archaeology and Historic Building timbers

Trees are timekeepers. Trees are also meticulous record keepers of climatic conditions. By unraveling the rich data stored in tree rings, scientists can do everything from dating archaeological sites and preventing forest fires to documenting planetary history and offering a crystal ball into our environmental future. Anything that affects a tree — precipitation, temperature, nutrients in the soil, fires, injuries — can show up in the rings.
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Tree-Ring Laboratory

From the beginning of history, we have relied on trees of various types to meet our needs. Much can be learned about a species of tree and its environment by discovering its age, and researchers employ several methods to date trees. The most common, most accurate way to find the age of a tree is to count the number of rings visible when their trunk is cut horizontally. Each year, most trees add an extra layer of growth to their trunks.
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Dendrochronology tree-ring dating is now an established science in Britain. Progress has been rapid over the last 30 years or so, and most parts of the country now have well-replicated oak chronologies against which to date oak timbers. Some parts of the country are more difficult than others, for example in East Anglia the oaks have in the past grown to sizes suitable for large structural timbers in years, whereas a similar sized timber in, say Worcestershire, might contain rings. This is important because the patterns of varying ring-widths need to be firmly matched against the reference material in order to be sure of establishing the date.
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