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Adequate moisture and a long growing season result in a wide ring. Alternating poor and favorable conditions, such as mid summer droughts, can result in several rings forming in a given year.

Trees from the same region will tend to develop the same patterns of ring widths for a given period.

The rings are more visible in temperate zones, where the seasons differ more markedly.Fully anchored chronologies that extend back more than 10,000 years exist for river oak trees from South Germany (from the Main and Rhine rivers).Timber core samples measure the width of annual growth rings.Given a sample of wood, the variation of the tree ring growths provides not only a match by year, it can also match location because the climate across Europe is not consistent.This makes it possible to determine the source of ships as well as smaller artifacts made from wood but which were transported long distances.

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