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Home / Times Past / Flagstaff’s Tree-Ring Study Pioneers (access required)

Flagstaff’s Tree-Ring Study Pioneers (access required)

Within the small scientific circle in Flagstaff in the 1920s were three men who combined their expertise to develop the science known today as dendrochronology, or tree-ring dating: astronomer Dr. Andrew E. Douglass (1867-1962); forester Gustaf A. Pearson (1880 -1949) and zoologist Dr. Harold S. Colton (1889-1970). Each man would become well-known and respected for this project and other scientific achievements in northern Arizona during their tenures.

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