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Tree dating site

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A recently completed database for the Four Corners region contains nearly 14,000 tree-ring dates from hundreds of archaeological sites; there are now over 4,300 tree-ring dates known from more than 140 archaeological sites in MVNP alone.

Also in the 1930s, Zeke Flora, an amateur archaeologist based in Durango, sent wood and charcoal specimens to Douglass.In particularly dry years, trees may fail to produce a growth ring at all.As a result, tree-ring dating requires use of a procedure called cross-dating.Everything else being equal, in a wet year trees will produce a larger growth ring.In a dry year, trees will produce a narrow growth ring.Start the journey by taking the e Harmony Personality Profile and get feedback that details how you relate to other Maine singles.

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Andrew Ellicott Douglass, an astronomer at the University of Arizona in Tucson, is considered the father of tree-ring dating.

He introduced the American public to the technique in a December 1929 article in entitled “Talkative Tree-Rings and the Tales They Tell.” In that article, Douglass published construction dates for six cliff dwellings at Mesa Verde National Park (MVNP) in southwestern Colorado, including Balcony House, Cliff Palace, Oak Tree House, Spring House, Spruce Tree House, and Square Tower House.

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Cross-dating is accomplished by documenting, analyzing, and matching repeated patterns of wide and narrow rings in tree-ring cores collected first from the same tree, then from trees in the same stand, and then from sites in the same region, all of which are responding to variations in the same climatic variable (e.g. Then, by working backward from the current year, the dendrochronologist is able to determine the exact year in which each growth ring was formed, thus producing a master tree-ring chronology.