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~`' 18 ~• Colorado. The Clovis point-mammoth association is well- established but researchers today are of the opinion that " ..these people used a combination of a hunting and gathering economy and exploited a wide variety of plant and animal resources." (Eddy,. et al 1982:38). Surface finds of Clovis points have been found on the Chaquaqua Plateau according to Campbell (1969). Following Clovis is the Folsom period (8,600-8,300 B.C.), distinguished by the small, finely-made fluted Folsom point. Folsom materials are generally associated with the remains of extinct animals such as Bison antiovus. Folsom seems to have been a successful cultural adaptation, which covered a wide geographical area and a correspondingly wide range of environmental zones. Unfortunately, despite its ubiquity, undisturbed Folsom sites are rare, most evidence of its existence coming from surface finds of Folsom points. Two such sites with Folsom points are reported by Campbell (1969) on the Chaquaqua Plateau The Folsom period is replaced at about 8,200 B.C. by the Plano period, the latter distinguished by large, lanceolate, and ,,. unfluted projectile points. Several sites in eastern Colorado C (e.g., Olsen-Chubbuck, Jones-Miller, Frazier, Jurgens, Frasca, Lamb Springs, Claypool, and Reenesburq) have returned radiocarbon dates from this period or contained distinctive Plano points such as Plainview, Agate Basin, and Firstview. There is some evidence that Plano peoples were hunting smaller game animals and gathering vegetal resources, but these activities are ~ overshadowed by the hunting of modern forms of bison. Many Plano ~ sites are bison kill or butchering sites. Eight sites on the Chaquaqua Plateau contain Plano artifacts (Campbell 1969). The Archaic stage (5,500-B.C.-A.D. 250) follows the Paleoindian I:r and shared many cultural characteristics. Subsistence is provided by hunting and gathering, and Archaic sites are very ~ often identified by the presence of distinctive projectile point I. types. Where it differs is in the hunting of smaller game animals (deer, antelope, rabbits, etc.) and a greater reliance upon vegetal resources. The Archaic stage is divided into three ~. broad time periods: Early, Middle, and Late. The Early Archaic period (5,500-3,000 B.C.) coincides temporally with that long period of drought known as the Altithermal. Some !,: researchers have suggested that the Great Plains were generally abandoned during this time, cultural groups moving into the foothills and mountains to the west where conditions were moister (Eddy, et al. 1983:39). The discovery of several Early Archaic sites on the Chaquaqua Plateau (Campbell 1969) and the Park Plateau (Lutz and Hunt 1979) suggests that either this abandonment model needs revision or that these geographic areas may have been refugia. Early Archaic Sites are identified by the presence of stemmed or side-notched projectile point styles such as Abasolo, Trinity, Pandale, and Travis (Eddy, et al. 1982:40).