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99 <br />• sites within a radius of several hundred meters from 5RT22. This could <br />be part of a larger occupation area with several exposures visible on <br />the surface. 5RT22 is the only site in the group containing tools diagnos- <br />tic of this period. The complex of four sites lies near the head of a <br />small seasonal drainage which shows evidence of earlier arroyo cutting. <br />Two of the sites in the group, including 5RT22, are not sheltered but <br />show evidence of domestic activities, making them open camps. The other <br />two are open lithic sites, <br />Projectile points, scrapers, and choppers which are evident here <br />are tools which could have been used for procuring and processing game. <br />The stands of Gamble's oak and serviceberry present in the area could <br />have provided ample vegetable food resources to be processed with the <br />.~ ground stone tools found in the site area. The implications are that the <br />sites were utilized by generalized hunter-gatherers, possibly in an ex- <br />tended family group. They either revisited the site locality or stayed <br />for some unknown period of time. The cultural materials, while not par- <br />titularly dense, are scattered over a substantial area. This would re- <br />sult from utilization of the area by a fair-sized group rather than a <br />i <br />small group of hunters camping overnight. The presence of ground stone <br />tools tends to support this supposition. <br />The Late Middle Prehistoric Period, according to Mulloy's trait list, <br />is characterized by the presence of corner notched projectiles with con- <br />vex or concave bases; or large projectiles with convex blades, prominent <br />barbs, and short, convex tangs (1958:151). This period is comparatively <br />well represented in the surface collection by projectile points from sites <br />in both the eastern and western tracts. <br />