114 



BUREAU OF AMERICAN ETHNOLOGY 



[Bull. 189 



d 







L- 



10 



cm. 



Htt^MttP^ 



Figure 21. — Ground stone artifacts, a, d, Arrow shaft smoothers, b, Catllnite pipe bowl. 

 c. Sandstone disk. <f, Diorite celt. /, Grooved abrading stone. 



the possibility that they were used as shaft smoothers ; it is more likely 

 that they were used to sharpen awls or other tools. Many of them 

 are small, with shallow V-shaped grooves which suggest that they 

 were used for delicate abrading. They are 30 to 70 mm. long, and 

 average slightly less in width. Other pieces of irregular sandstone 

 have larger, more prominent U-shaped grooves. They vary greatly 



