Methods of dating from tree rings

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Ring-counted ages are derived by simple ring counts and may contain errors in age due to missing or false rings, suppressed areas, poorly surfaced samples, or other types of tree-ring anomalies (e.g., injuries).

The planet's trees have seen plenty of history pass by their trunks.

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The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.Tom worked up the cores Schulman collected sometime around 2010, and discovered the tree's age at that time.The tree is still alive, and the age given below, 5062 years, is its age as of the growing season of 2012.Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.

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