230 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



visited by at least two different groups. There is no blending or obvi- 

 ous relationship between the two ceramic types, nor was there any 

 evidence of superimposition of either. The two ceramic types are 

 illustrated (pi. 24, fig. 2, a, b; also compare pis. 5, 9, 21, 22). 



Ground Stone 



Ground stone artifacts occur in all three levels. From level III come 

 13 irregular fragments of thin sandst(jne rubbing stones, worn on both 

 sides (pi. 24, fig. I, y). There are four nodules of sandstone used for 

 abrasive purposes and seven shaft polishers, each with a single longi- 

 tudinal groove. Three of the latter are rectangular, and four are 

 irregular (pi. 24, fig. i, zv, x). The best specimen (pi. 24. fig. i, .r) 

 suggests a type from level I. (Since it has probably always been im- 

 possible to gain the top of the l)utte without noticing the numerous 

 artifacts where level I outcrops all around the edge, many of these 

 ancient artifacts were picked up by the later peoples and used for their 

 own purposes. In the same manner a few level II artifacts were evi- 

 dently carried into level III. Xo distinct upper level types ( II or III) 

 occur in level I, but distinct level I types occur in varying proportions 

 in the two upper levels). Level III also yielded 9 battered hammer- 

 stones (pi. 24, fig. I, aa), all but 2 of which are broken, 5 pieces of 

 polished hematite (pi. 24, fig. i, s), i piece of iron oxide, and 2 frag- 

 ments of a green mineral containing copper. The latter were obviously 

 used as paints. Level II yielded one long oval lapstone, numerous 

 irregular flat-sided grinding stones, ovoid and battered hammerstones, 

 and some hematite. Level I, with its much greater artifact content, 

 yielded several types of ground stone implements. These include 

 numerous flat sandstone or pumice grinders of irregular shape (pi. 25, 

 fig. 2, /) ; numerous rounded or natural pebble hammerstones (pi. 25, 

 fig. 2, i) ; a number of pestlelike objects (pi. 25, fig. 2, d) ; two long, 

 cylindrical, longitudinally grooved, shaft polishers (pi. 25, fig. 2, ;') ; 

 two broken grooved hammerstones or mauls (pi. 25, fig. 2, 0), and a 

 flat smooth quartzite ax battered on both edges and slightly notched or 

 grooved at top and bottom (pi. 25, fig. 2, in). Both rough and ground 

 pieces of hematite and limonite paint occur. 



Chipped Stone 



Chipped stone artifacts comprise the bulk of the Signal Butte col- 

 lections, being especially numerous from the lowest occupation level 

 (I). A wide range of materials is represented in all levels, with cherts, 

 chalcedonies, quartzites, and jaspers predominating. Obsidian flakes 



