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times larder than the other two flakes and reveals unifacial wear on • <br />opposite faces of the same margin and bifacial crushing along a second <br />edge (Fig. 9 d). Specimen 139.103 is also unique since it was recovered <br />fran Layer 1 in the southwest quadrant of EU1 whereas the other two <br />flakes were both found in the badcdirt pile north of EU4. <br />Debitage. The most cornon class of artifacts recovered from mitigation <br />excavations at SRP139 is utmiodified lithic flakes, herein referred to as <br />debitage. The horizontal and vertical location, material type and color, <br />stage of manufacture, and evidence of heat treatment for each unmodified <br />flake is provided in Table 8, interpretations of which follaa. <br />Except for those flakes recovered during topsoil removal (with no <br />horizontal provenience), more debitage originated fran excavation emit 2 <br />(33~), followed in order by EU1 (12~), EU3 (6~), and EU6 (6~). The <br />majority of the debitage occurred in Layer 2 (58$), although Layer 1 did <br />contain a substantial number of flakes (398). Greater variety exists in <br />material type and wlor but the majority of specimens are manufactured • <br />fran a light-colored chert. The overwhelming majority (85~) of the <br />debitage is secondary flakes, while only a fea (15~) are tertiary flakes, <br />and none are primary. It should be noted that the large number of <br />thermally altered flakes has been the major factor contributive to this <br />predaninanoe of secondary flakes. Although especially evident in the <br />debitage, thermal alteration of lithic materials has also been reoogrLized <br />in the other artifacts previously described, including surface as well as <br />excavated specimens. <br />It could seem that the prehistoric occujasnts of site SRT139 were systan- <br />atically heat treating cherts so as to alter the chemical properties of <br />these materials and thereby improve their flaking properties. In same <br />cases they were probably successful, but in many other exanQles they <br />were not so fortunate. Much of the debitage is reflective either of the <br />unsuitability of these materials for thermal alteration or the inability <br />of these people to control the treatment process. Detailed thermal • <br />44 <br />