110 BUREAU OF AMERICAN ETHNOLOGY [BnU. 189 



20 mm. These shafts are alternately beveled, with rhomboidal cross 

 sections. Material includes chalcedony, quartzite, and petrified wood. 



Broad knives (117 specimens) : 



Bipointed, convex blade edges (2 specimens). — ^Leaf-shaped knives 

 with pointed ends are bifacially flaked, having lenticular cross sec- 

 tions. One of them measures 115 X 36 X 10 mm. ; the other 100 X 40 X 

 8 mm. They are made from a gray chert and from fine-grained 

 quartzite (fig. 18, e). 



Triangular blade, coTwex bases (35 specimens). — Blade edges are 

 strongly convex; tips are pointed. Each is bifacially flaked, with a 

 lenticular cross section. The three complete specimens are 78 to 95 

 mm. long, 31 to 33 mm. wide, and 8 to 9 mm. thick, although broken 

 specimens suggest original lengths exceeding 100 mm. ; widths of 46 

 mm. ; and thicknesses of 15 mm. (fig. 18, /) . 



Triangular blade, straight bases (3 specimens). — Blade edges are 

 gently convex ; tips are pointed. The bases of these bifacially flaked 

 knives are thinned on only one side, resulting in beveled bases. They 

 are 57 to 70 mm. long, 31 to 43 mm. wide, and 8 to 12 mm. thick. 

 Materials were vein chalcedony, Knife Kiver chalcedony, and gray 

 chert (fig. 18, a). 



Oval knives (77 specimens) . — ^Thirty-one of these knives are oval to 

 round, with convex edges and rounded to somewhat flattened ends. 

 All are lenticular in cross section and are bifacially flaked. The six 

 complete knives are 40 to 115 mm. long and 32 to 68 mm. wide. Thick- 

 ness ranges from 7 to 11 mm. Broken specimens suggest widths 

 were sometimes as low as 28 mm., and thicknesses ranged up to 14 mm. 

 Kjiife River chalcedony, quartzite, petrified wood, and gray chert 

 served as raw materials (fig. 18, c) . 



Forty-six specimens have more nearly parallel edges. The six com- 

 plete specimens range from 60 to 95 mm. long, and from 28 to 30 mm. 

 wide. Thickness ranges from 10 to 13 mm. Broken specimens sug- 

 gest that original lengths sometimes exceeded 100 mm., and widths 

 exceeded 45 mm. Materials are petrified wood, vein chalcedony, and 

 quartzite (fig. 18, g) . 



Narrow knives (13 specimens) : 



These knives are similar in form to the broad knives described above 

 as bipointed, with convex blade edges, but they are narrower and better 

 made than the broad group. These differences may have resulted from 

 their use in a special context. Their size and form is well adapted for 

 insertion in the slotted bone or wood knife handles from the site (fig. 

 20, b-c). The five complete specimens are 62 to 83 mm. long, 15 to 24 

 mm. wide, and 6 to 10 mm. thick. One broken knife may originally 

 have been 150 to 170 mm. long. Knife River chalcedony, quartzite, 

 and variously colored cherts were used as raw materials (fig. 18, h) . 



