In 1937 Gila Pueblo reported on its excavations at Snaketown, a large Hohokam site in southern Arizona, in which a time range from 300 B.C. to 1100 A.D. was assigned (Gladwin, et al, 1937). Gladwin (1942) then presented a revision, based on his own comparative treering research, in which he raised the beginning date for the site up to 600 A.D. In his latest publication Gladwin (1948) brings a second revision in which additional time and cultural alterations are offered. These are again based on his own dendrochronological studies. These results he correlates in turn, on a broad scale, with the Mogollon development.