Tree ring cross dating

In scientific terminology, tree growth rings are used as proxy indicators for past environmental variations.

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Dendrochronology is governed by a set of principles or scientific rules.

These principles have their roots as far back as the Principle of Trew and have continued to evolve as recently as with the Principle of Aggregate Tree Growth.

During the latter half of the nineteenth century, the scientific study of tree rings and the application of dendrochronology began.

In 1859, the German-American Jacob Kuechler (1823–1893) used crossdating to examine oaks (Quercus stellata) in order to study the record of climate in western Texas.

The science that uses tree rings to date when timber was felled, transported, processed, or used for construction or wooden artifacts.

Example: dating the tree rings of a beam from a ruin in the American Southwest to determine when it was built.The science that uses tree rings to date earth surface processes that created, altered, or shaped the landscape.Example: analyzing changes in tree growth patterns via tree rings to date a series of landslide events.Instead of working with entire cross sections of trees, dendrochronologists (tree-ring researchers) often use long, slender cores extracted from trees by a hollow tool.The diagram below shows two cores from different trees in the same area.New growth in trees occurs in a layer of cells near the bark.

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