i6 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



circular with one flat and one convex face. Still others are circular 

 with two flat faces and a wedge-shaped cross section. There are 

 examples that are little more than natural pebbles with a single 

 flat or only slightly convex face. In some cases the edge between 

 the two grinding surfaces was pecked, in others it was not. There 



Fig. 3. — Manos or hand grinding stones. (One-third actual size.) 



apparently is no correlation between outline, grinding surface forms, 

 and the pecking of the edges. The latter may or may not be present 

 on any of the two-faced forms. No one type of mano seems to have 

 prevailed over the others or to be characteristically associated with 

 one type of point. In general they are similar to those found at most 

 sites throughout the region occupied by users of native food plants. 

 In contrast to many locations, none of the San Jon examples has a 



