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1 <br />~' <br />subsurface concentrations of flaked stone artifacts were found <br />during excavations on portions of site SBL876, while no surface <br />' artifacts were evident. Lithic material types noted among 93 <br />flakes and eight formal tools recovered from five strata on site <br />5BL2431 included chert, chalcedony, petrified wood, quartzite, <br />' rhyolite, and mudstone. Using material from two radiocarbon dated <br />strata, it was found that different relative frequencies of lithic <br />' material type were associated strongly with different temporal <br />periods. Chert, petrified wood, and chalcedony occurred most <br />' frequently among deposits associated with the Early Ceramic or <br />later periods. Quartzite, mudstone, and rhyolite occurred most <br />frequently among deposits associated with the Late Preceramic or <br />earlier periods. <br />Average flake size also changed significantly across strata, <br />with larger flakes occurring in the lower strata. However, careful <br />statistical analysis indicated that this trend was due uniquely to <br />' the effect of different material types and could not be attributed <br />to temporal variation. In the excavated sample, approximately 35 <br />' percent of the variability in lithic material type was attributed <br />to temporal differences and about 16 percent of the variability in <br />flake size was attributed to differences in material type, with no <br />interaction between temporal variability and flake size (Grant nd). <br />These results are not supported by findings from site SBL876 where <br />' a smaller lithic sample, consisting primarily of cherts, was <br />recovered in association with a radiocarbon date of 2140 +/- 200 <br />year B.P. (Cassels and Farrington 1986). <br />' Research Data Requirements <br />The following research questions provide a starting point for <br />inventory, evaluation and interpretation of the prehistoric <br />technologies represented at Dowe Flats. These questions are broad <br />enough to allow flexibility and information gathering for any <br />' unexpected discoveries made during mine operation. <br />77 <br /> <br />