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In archaeology, dating techniques fall into two broad categories: chronometric (sometimes called “absolute”) and relative.

Chronometric dating techniques produce a specific chronological date or date range for some event in the past. Relative dating techniques, on the other hand, provide only the relative order in which events took place.

However, the stratigraphic position alone cannot tell us the exact date.

Using local pine trees, Douglass built a 450 year record of the tree ring variability.

Clark Wissler, an anthropologist researching Native American groups in the Southwest, recognized the potential for such dating, and brought Douglass subfossil wood from puebloan ruins.

Without those, the archaeologists were in the dark as to the age of various societies. The use of tree ring data to determine chronological dates, dendrochronology, was first developed in the American southwest by astronomer Andrew Ellicott Douglass.

In 1901, Douglass began investigating tree ring growth as an indicator of solar cycles.