HRDLicKA] STONE INDUSTRIES OF THE ARGENTINE COAST 



129 



upon the anvil-stone while the other end was struck sharp blows 

 with the hammer. As a result the ends of the pebbles were split or 



Fig. 9. Discoidal pitted hammer of quurtzite, Fig. 10. Hammer made of a felaite bowlder, with 

 with beveled periphery. (J actual size.) pitted sides. (^ actual size.) Necochea. 



splintered or flakes were driven off. In some cases the blows were 

 continued until the ends of the pebbles became quite battered and it 



Fig. 11. Chipped quartzite hammer, with battered 

 periphery, (i actual size.) Mar del Plata. 



Fig. 12. Small hammer of greenish fel- 

 site. (j actualsize.) Necochea. 



is difficult to say always whether the strokes were repeated in the 

 attempt to drive off other flakes or to reduce the ends of the pebble 

 to a desired shape. It 

 is seen that in numer- 

 ous cases, as a result 

 of the removal of 

 flakes, one or both ends 

 acquired a somewhat 

 ragged edge which 

 was squarish or shght- M 

 ly rounded in or 

 notched, giving to the 

 object, whenbothends 



were so flaked, a fig. is. Roughly grooved hammer of quartzite. (iactrtal size.) 



shuttle - hke outhne ^^"p° ^^'''^^^■ 



(fig. 15). In figure 16 two examples are shown, the first chipped at 

 both ends and having the shuttle form and the second a veiy small 

 21535°— Bull. 52—12 9 



