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Ck' 19 Grinding implements such as manos and mortars are commonly found at sites with Early Archaic point types suggesting a greater emphasis upon the gathering and processing of plants to supplement a meat diet. In their survey of the Park Plateau, Lutz and Hunt (1979) observed that base camps are more common in the lower elevations of the Pinyon-Juniper/Oakbrush zone, a consequence possibly of the abundance of edible plants in that • zone. The Middle Archaic period (3,000-1,000 B.C.) is little different in its mode of subsistence from the Early Archaic, since hunting and gathering are equally emphasized. The two periods are distinguished only by a superficial change in projectile point styles (Eddy, et. al. 1982:40). occupational layers at Draper Cave and a rockshelter at the Carrizo Ranch (5LA1055) have been radiocarbon-dated at 1,530-1,570 and 1,190 B.C., respectively. Surface finds of putative Middle Archaic artifacts are common: Lutz and Hunt (1979) attribute 14 sites and 2 isolated finds on Park Plateau to this period. r. The Late Archaic period (1,000 B.C.-A.D.250) is distinguished by stemmed and corner-notched projectile point types such as Yarbrough, Ellis, Edgewood, Palmillas, Shumla, and Marcos (Eddy, et al. 1982:40 and Figure 4.2). A shift towards the hunting of small game animals (e.g., rabbits and larger rodents) is indicated, and a greater emphasis upon vegetal resources is suggested by a general increase in grinding implements. On the _ Chaquaqua Plateau, there seems to be a preference for canyon site locations (Campbell 1976). Lutz and Hunt (1979) assign 14 sites and 2 isolated finds to this period. Most of these are found in the Pinyon-Juniper/Oakbrush zone but a significant number also - occur in the Ponderosa zone at higher elevations. A notable cultural addition is the appearance of rock art. Ir,, ' h 3 The Formative stage (A.D. 250-1550) is distinguished from the preceding Paleoindian and Archaic by the appearance of pottery, the bow and arrow, substantial architecture, and a shift in subsistence practices with the introduction of maize horticulture (Eddy, et al. 1982:40). It can be divided into three sub-stages: . Plains Woodland, Plains Village, and Terminal Prehistory. The Plains Woodland sub-stage (A.D. 250-1000) is characterized by three patterns: Transitional, Initial, and Terminal. The C'' Transitional Woodland pattern (A.D. 250-450) is, as the name ~_ suggests, a period of transition during which groups maintained an Archaic lifestyle but gradually adopted Woodland traits. Dart point styles such as Catan, Kent, Ellis, and Yarbrough f~,; predominate, but Scallorn arrow points are also present. Deep, p ry sherds appear at this time and are similar to `" cordmarked otte those ceramics which distinguish the Parker Focus in the southern Denver Basin. Grinding implements become more abundant, indicating an increasing dependence upon vegetal resources. Direct evidence of maize horticulture, however, is absent. A general uniformity in artifactual assemblages and subsistence t