holmes] 



ABOEIGINAL AMERICAN ANTIQUITIES PART I 



161 



shows that the natives had sometimes entered on the okl schistose 

 surface, undermining and knocking down the bowlders above en 



Fig. 44. Section of blufls showing position of bowlder quarries. 



masse (fig. 45). The ordinary profile of the quarry face is shown in 

 figure 4G. 



The slopes below the bowlder outcrop are deeply covered with 



quarry refuse and the rejectage of blade making, the 

 The Shaping Work deposits of these materials reaching in places a depth 



of 10 feet or more. The bowdders were freed from the 

 compact matrix of indurated argillaceous sand and thrown out, and 



Fig. 45. Section of bowlder quarry showing undermining and a pocket of shop refuse. 



the shaping work was begun on the spot. Countless numbers of the 

 bowlders were tested for (juality of the material by striking otf a few 

 flakes, and being found unsatisfactory, were cast into the refuse (fig. 



