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77 • base (our non-stemmed projectile points), and is an easily visible cor- relate with Strong's (1935) type Nnb3, radiocarbon dated at 2600 BC (Neuman 1967:417). A fourth type, broad, leaf-shaped, with side notches and a concave base, is very similar to a type reported from levels 17, 18, and 19 at Mummy Cave (Wedel, et al. 1968), which has radiocarbon dates ranging from 5680-5190 BC. The early end of the time frame, then, begins in the Early Archaic and continues to Mulloy's Late Prehistoric-Historic period, evidenced by the small, flat-based, side notched projectiles discussed above (Mul- loy 1958:151-52). Perforators and graving tools, Type Zi. F1Ve SpeClmenS (Fig. 9h-1). Description: a sharply convergent or linear silhouette, formed by pres- sure flaking; the basal portion, where present, is generally broader and heavier than the bulk of the tool. They range from linear forms and pro- bably drills, to small sharply angled and pointed forms, which may be perforators. Material: chert. Cross sections: they range from triangular to nearly circular. Edge wear: consists of step flaking confined to opposite faces of op- posing edges. Variation: silhouettes range from.a broad triangular shape to a narrow, almost cylindrical one. The degree of modification and amount of retouch is consistent with the profile, so that the broadest specimens have mini- mal retouch while the narrowest exhibit considerable retouch of the origi- nal flakes. Special notes: the two largest items (Fig. 9i, j) in this category appear to have been used as drills. This is evidenced by step flaking at the juncture of the two faces on each drill. The wear is confined to opposite faces, suggesting a one-way, left handed twisting motion against the drilled material. The remaining two specimens (Fig. 9k, 1) are most likely gra- vers, but could have been used to puncture softer materials or to drill thin objects. The wear, however, does not support this. Instead, the smaller of the two (Fig. 91) exhibits polish on the edge rather than step flaking. Correlation with other sites: similar tools have been reported from the Taylor Site, levels 1-4 (Wormington and Lister 1956); the Turner-Look site (Wormington 1955); the Lo Dais Ka site, mostly between the 44-68 in. levels (Irwin and Irwin 1959). Perforators and graving tools: gouge, Type IJ. Dne specimen (Fig. 9m). Description: the tool has a sharply convergent working tip produced by percussion flaking, and resulting in a rectangular, chisel-like point. The tool is made from a small nodule, and only modification to produce a working point is necessary. Material: chert.