HRDI.K'KA I 



S'l'ONK INDUSTRIKS OK THK AKC^KNTINK COAST 



137 



the so-called ])obblc implements of the Arf2;entine coastal sites— the 

 chisel and shutth^like shapes, the notched and cui-ved ed<:;e and the 

 appearance of wear from use — are exactly duplicated in the forms 

 produced by these experiments. 



As a result of his experiments, the writer is confirmed in the view 

 that the hammer-anvil work was aimed at the ])i()(hiction of the 

 plano-convex flakes intend(>d for use, uns|)ecialized or specialized 



Fiti. 2i. Chipped implements of bliick jasper* 

 (i actual size.) a, Leaf-shaped l)la(ie (Arroyo 

 Corrieiites). h, Kiide blade, probably a reject 

 from arrow-making (Neeoehea). 



Fuj. '25. Spikelike forms of black jasper 

 pebble derivation, jjossibly reje(tts from 

 arrow-makiiiK. (1 actual size.) a, Mi- 

 raiiiar. /), Necocliea. 



as knives or scrapers, or for elaboration into othei- forms of im|)l(v 

 ments, and that the body of the pebble, the nucleus, was Jiot in- 

 tended as an implement at all, tmd was never used as such, uidess 

 incidentally. Experiment can hardly fail to convince the most 

 skeptical of the correctness of this view. Examples of the forms 

 resulting from the ex])crimental work are inchuh'd in ])lat(^ 12 in 

 association with specimens of like genesis left by the ancient inhab- 

 itants of the Arf:;entine coast. 

 Figure 23 is intenthnl to illus- 

 trate further the pebble-frac- 

 turing work. In a we have a 

 pebble nucleus from the Ar- 

 gentine coast from which two 

 flakes have been removed by 

 one, or at most, two strokes 

 of the hammer. These flakes 

 were of the teshoa type and 

 doubtless served some useful 

 purpose for the maker. Forms 

 h and c represent a Potomac pebble of similar shaj>c which shows 

 the result of two exi)erimental blows with the hammer. In h the 

 flakes have been removed. In c they are replaced, and in d they 

 are separately shown. It may be added here that the hannner- 

 stones and anvil-stones used in the experimental work described 

 above display, as the result of the fracturing work, markings iden- 



Kui. 26. Scrapers of jasper. ( J a(H(iaI si/e.) a, Duck- 

 bill scrapiT of brown jasjjer (Ne(^o(?hea). b, Flat 

 scraper of olive jasper ( Monte Ili'rmoso). 



