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Chapter 2
Review of the Archaeological Data
Kenneth M. Ames

Figure 25

Figure 25 provides a curve of mountain glacial advances and retreats that is temporally correlated with radiocarbon dates from four projects on the Upper Columbia River. This information is derived from a 1985 report by Salo and reproduced with permission of the author. The four projects listed as column headers from left to right are: Grand Coulee Dam (Kettle Falls), Chief Joseph Dam, Wells Hydroelectric Project, and Priest Rapids/Wanapum. Most of the dates are associated with the Chief Joseph Project. The distribution suggest a gap in regional and local dates, a point that Ames noted was made by Schalk et al. 1998 as a possible explanation for apparent increases or decreases in pit house constructions. Most of the dates from sites encountered during the Chief Joseph Project are associated with occupations during the Temple Lake glacial advance between 3500 and 2500 years B.P., prior to the Gannet Peak glacial advance (c. 1500 to 1000 years B.P.), and during the Gannet Peak glacial advance since 1000 years B.P. A pronounced decrease in radiocarbon dates between c. 2300 and 1500 years B.P. was noted during the Chief Joseph Project, although sites dated to this period were found during the Grand Coulee and Priest Rapids/Wanapum projects.

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