76 



BUREAU OF AMERICAN ETHNOLOGY 



[Bull. 182 



INCHES 



Figure 7. — Planoconvex and lunate scrapers. 



great age appears to be the only possible way of explaining the con- 

 dition, while the other specimen, though of clearer definition, has 

 more distinct and sharper chipping scars. Tools of this classification 

 are combination tools in that they could be used either as end or side 

 scrapers. The fresher appearing specimens have a graver tip at one 

 end which appears to have resulted from later rechipping. Lengths 

 vary from 74 mm. to 84 mm., widths from 20 mm. to 25 mm., and 

 thickness from 10 mm. to 14 mm. 



A nimiber of pentagonal side scrapers have graver tips while the 

 remainder lack this feature. All occur on moderately thin, 6-mm. to 

 8-mm. flakes that were cast off from a core and later retouched along 

 one or more edges. All were made from a bluish-green to bluish- 

 black chert. The one exception was made from a flesh-colored rhyo- 

 lite flake which, at the present time, is badly weatliered. 



A single sermcircular scraper (figs. 6, a; 8), was made out of an 

 extra large, broad chert flake, 108 mm. long, 80 mm. across its widest 

 section, and 14 mm. thick (pi. 0. h). The edges were first pressure- 

 chipped wnth rather broad sections being cast off; later the working 

 edge was retouched with much finer chipping, which sharpened the 

 blade section of the tool. Opposite the bulb of percussion of the 

 flake, there is an indentation equal in depth to the height of the bulb 

 of percussion. This slight depression just naturally fits the thumb of 

 the left hand and is on the correct side of the beveled blade. Scrapers 

 of this class do not occur regularly and when found they always ap- 



