. Bulletin. Ethnology. 144 BUREAU or AMERICAN ETHNOLOGY [bull. 52 ^V/. stone and finished with a pressure implement. Practically all of the well-developed forms are of leaf-blade genesis, specialization having taken different directions according to the implement to be made. The few scrapers were made from flakes of proximate shape and correspond closely in type with the duck-bill scrapers of the white quartzite and pebble groups. The plano- convex knife-blades and the spikelike forms so common in the white quartzite and shore- pebble groups are of rare occurrence. Incip- ient blades unfinishe
. Bulletin. Ethnology. 144 BUREAU or AMERICAN ETHNOLOGY [bull. 52 ^V/. stone and finished with a pressure implement. Practically all of the well-developed forms are of leaf-blade genesis, specialization having taken different directions according to the implement to be made. The few scrapers were made from flakes of proximate shape and correspond closely in type with the duck-bill scrapers of the white quartzite and pebble groups. The plano- convex knife-blades and the spikelike forms so common in the white quartzite and shore- pebble groups are of rare occurrence. Incip- ient blades unfinished or rejected because of imperfect fracture, of which there are numer- ous examples, are shown in figure 40, and a series of forms illustrating the relation of the first step in the shaping work to the more finished and specialized forms is given in figure 41. The ruder specimens are sometimes re- ferred to as "paleolithic," but without other reason than that they are not well-finished. It is not assumed that the final form in this series is the only one that may have been employed as an implement, but the lack of specialization or careful finish of point or edge in the ruder forms supports the assumption that these were not finished implements. A representative series of the arrowheads appears in plate 13 and a typical drill-point or awl is shown in figure 42. To the North American student the most striking characteristic of these flaked forms is their remarkable . _, . analogy with North American types. The entire collection from the Rio Negro could be thrown together with corresponding collections from Ari- zona, Georgia, or New Jersey with the practical certainty that the student would be unable to separate more than a few of the specimens of the several regions. Fig. 37. Pestles, (i actual size.) o, Quartzite pestle of cigar shape (San Bias Dis- trict), b, Sandstone pestle, fragment (San Bias District).. Fig. 38. Axlike blade of sandstone, bear- ing engraved desi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectethnolo, bookyear1901
