In 1929, astronomer A.E. Douglas revolutionized Southwestern archaeology when he published for the first time precise dates for 40 sites. Until then, prehistoric dates had been merely relative. He did it with a new process of counting tree rings from beams found in the ruins and called the technique dendrochronology. Author Stephen Edward Nash details this remarkable development from its origins in 1914 through 1950. It’s one of the most important discoveries of American archaeology, and a great story as well.
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