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This careful inspection helps us classify and record the narrow and extremely narrow rings, the very wide or average width tree rings, false rings, micro-rings, traumatic resin ducts, past injuries to the xylem from a vartiety of disturbance processes, changes in growth rates, even a location where a ring should be but is not.

The science that uses tree rings to study factors that affect the earth's ecosystems.In fact, the introduction of "divergence" into the dendro-lexicon in the late 1990s epitomized the changing response of trees to climate over time, first scrutinized in detail in the mid-1980s. Perhaps it actually "Paradoxically, in suggesting that this term now be dropped from use, we pay a most fitting tribute to its vital role in the history of geology." -- Stephen Jay Gould, 1965, "Is uniformitarianism necessary"?This principle states that matching patterns in ring widths or other ring characteristics (such as ring density patterns) among several tree-ring series allows the identification of the exact calendar (or relative) year in which each tree ring was formed.A tree-ring chronology therefore represents departures of growth for any one year compared to average growth.For example, an index of 0.75 (or 75) for a given year indicates growth below normal (indicated by 1.00, or 100).

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