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90 • rounded ends. .Cross sections shiow fairly vertical ends and sides. Tlie junction between the pecked sides and working surface is angu- lar rather than curved. hlaterial: sandstone. Edge wear: pecking and grinding. Six have pecking only on the work- ing surface and margins. One has pecking on the working surface only, and one has grinding only on the margins and working surface. Size range: length, 125-148 mm.; width, 89-94 mm.; and thickness, 46-66 mm. Special notes: two specimens are larger than the rest, but exhibit no other distinctive features. Ground stone: re ared, rectan ular, bifacial mano, T pe ZVC. Eight specimens rg. a . Description: substantially similar to oval types except that the ends have a much greater degree of pecking or grinding, resulting in an overall rectangular shape. This category shows heavier wear than the oval types. Materials: basalt and sandstone. Edge wear: pecking and grinding. Five specimens have heavy pecking and grinding on ends, producing a nearly vertical straight end. Two specimens are pecked only to flatten the ends. Otherwise they are indistinguishable from pecked and ground specimens. One other speci- men is battered on both ends, producing irregular squared ends. Size range: length, 104-108 mm.; width, 76-92 mm.; and thickness, 39-62 mm. Special notes: all specimens have Plano-convex or biconvex cross sec- tion, and a sharply defined intersection of the working surface with the sides. Ground stone: pre ared, irre ular, bifacial manos, Ty a IVD. Flve specimens. Fig. 12a . Description: irregular ovate outline, with modification variable as to type, location, and degree. Materials: granitic, quartzite, and sandstone. Edge wear: pecking and grinding. Size range: length 102-126 mm.; width, 96-105 mm.; and thickness, 29- 52 mri. Special notes: these specimens make up a residual catagory of unique items which do not fall into any of the above types. Prehistoric pottery, minerals, and bone objects. Other than the items outlined in the previous sections, the collection of prehistoric arti- factual materials is extremely limited. Only four non-lithic items • were recovered. One of these, a ceramic sherd, is of cultural origin.