30 BUREAU OF AMERICAN ETHNOLOGY [Bull. 189 



Group 4) ^E {1 specimen). — Oval in outline, this specimen of 

 Knife River flint is M mm. long, 28 mm. wide, and 12 mm. thick. 

 The ends and sides are convex. 



Group 5, hose fragments [6 specimens) . — These five specimens are 

 convex base fragments from knives that had gently convex to straight 

 sides. Materials include gray chert, Knife Eiver flint, and petrified 

 wood. These fragments are from knives that were originally more 

 than 62 mm. long. 



Group 6, Hade tips (7 specimens). — These tips are from knives 

 which had pointed but not sharp tips, and had convex sides. Lengths 

 are in excess of 121 mm., and widths are from 22 to 35 mm. Materials 

 are Knife River flint, gray chert, and Bijou Hills quartzite. 



Narrow knives 

 (5 specimens) 



Long slender knives, bif acially flaked, are made from Knife River 

 flint. Two complete specimens are NAb2 in outline and one is NAa. 

 Two are tips. The sides are gently convex and nearly parallel. 

 Lengths are 66, 72, and 83 mm. ; widths, 21, 14, and 18 mm. ; thickness, 

 5, 5, and 6 mm., respectively (fig. 4, h) . 



Choppers 

 (34 specimens) 



Group 1 {12 specimens) . — These tools are oval to nearly circular, 

 and are bifacially flaked, with large flake scars on both faces and 

 retouching on the edges. Battering is evident on some of the ends. 

 The material includes gray chert, quartzite, and quartz. They range 

 in length from 70 to 172 mm. ; in width, from 41 to 99 mm. ; in thick- 

 ness, from 18 to 28 mm. 



Group 2 {10 specimens). — Roughly rectangular blocks of quartzite 

 are bifacially flaked along one edge. The faces of the implements 

 are unmodified. There is some use retouching along the blade edge, 

 and the blades extend the length of the tool. Lengths are 90 to 205 

 mm. ; widths, 50 to 90 mm. 



Group 3 {12 specimens) . — Irregular spalls of stone, including gran- 

 ite, quartzite, and gray chert have bifacially flaked edges along one 

 edge of the stone and show some retouching. The specimens attain a 

 maximum diameter of 130 mm. 



Flake knives 

 (135 specimens) 



Flakes of Knife River flint, petrified wood, gray chert or quartzite 

 are classed as flake knives when they have a prepared edge on one or 

 more edges. 



