Published online by Cambridge University Press: 20 January 2017
On the basis of an analysis of data from 34 of the most thoroughly examined sites in the Upper Willamette Valley of Oregon, a chronological framework is devised that divides the prehistory of the region into five major periods: Period I, ranging between 8000 and 6000 B.C.; Period II, between 6000 and 4000 B.C.; Period III, between 4000 and 250 B.C.; Period IV, 250 B.C. to A.D. 1700; and Period V, the protohistoric and historic period dating between 1700 and approximately 1850. The bracketing dates for these periods are based on a combination of chronometric and relative dating techniques, including radiocarbon dating, tree-ring counts, typological comparison, pollen analysis, cross-dating with historic artifacts, and stratigraphy.