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Tree-ring or dendrochronological analysis relies upon a number of basic concepts. Trees in temperate zones of the world have a single growing season and a single resting season each year. The anatomical result of this is an identifiable tree-ring within the trunk of the tree that has a distinct boundary marking the end of one growing season and the start of the next. Since the growing point of the trunk is the cambium layer directly under the bark, it follows that each years growth appears on the outside of the previous years growth. The oldest rings of a trunk are thus in the middle and the most recent rings are directly under the bark. Counting the rings provides as easy method of ageing trees but does not provide a method of dating the trees.
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