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Samples taken from trees of unknown age can then be studied for matches with samples from trees with known sequences of growth.

Using this process, when the rings "match" or are found to be overlapping in age, we are able to "see" even further back in time.

By analyzing the timbers used in its construction, they determined its existence 800 years before Columbus.A large portion of the effects of nonclimatic factors that occur in the various site data is minimized by this averaging scheme.A number of computer programs are used to calculate statistical data.These first new cells are large, but as the summer progresses their size decreases until, in the fall, growth stops and cells die, with no new growth appearing until the next spring.The contrast between these smaller old cells and next year's larger new cells is enough to establish a ring, thus making counting possible.

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