The overwhelming preponderance of artifacts consists of ground stone tools or, more precisely, tools not only shaped for grinding but shaped by grinding. The ratio of ground to chipped stone implements is six to one if hammerstones are included with the latter, and nine to one if hammerstones are disregarded in the calculation. The largest categories are the manos and milling stones. In view of the generous sample and the possibility that ecological and cultural implications may be derived from it, and in the hope of facilitating reference and comparison by other investigators, a very detailed analysis has been made. The general approach is a classification by pattern of wear (i.e., grinding or pounding), motor habit (circular or linear), and correlation of mano shapes with milling stone styles wherever possible.