Abstract
Since 1929 Southwestern archaeology has stood on a much surer footing than at any other time in the history of its development. This stabilization is due to the research of Dr. A. E. Douglass of Tucson, Arizona, whose inquiries into the reaction of trees to weather, from an astronomic standpoint, led, as a ramification, to the use of the annual growth rings in trees in dating the pre-Spanish remains of man in the Southwest. From the standpoint of the archaeologist, the most significant progress date in Dr. Douglass' study was June 22, 1929. On that day ended a long search for a particular sequence of rings needed to complete the ring record. This sequence was found in a log in the Showlow ruin, and united two chronologies then extant, the one a floating series of five hundred and eighty years, the other an historic series extending from 1929 to about 1280 A.D.
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