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-11- <br />~~• <br />pursuit, the use of natural traps such as arroyos, bogs or ponds, and <br />buffalo jumps CWheat 1972: 159-164; Wilson 1978: 11-12; Frison 1978: 149). <br />A number of Folsom sites have been recorded in northwestern Colorado and <br />southwestern Wyoming, as well as at high altitudes in the Front Range <br />(B. Walton 1979: personal communication; B. Naze 1979: personal communication; <br />Benedict 1975: 71). <br />Dates for the Plano Complex, the most recent of the Paleoindian <br />traditions, extend from 8200 B.C. to 5500 B.C. and overlap with the <br />terminal dates of the Folsom Complex. The artifact assemblage of the <br />Plano Tradition includes a variety of parallel pressure Flaked, lanceolate <br />shaped spear points and flat millinstones, which indicate the utilization <br />_ of plant resources. Plano tradition tools are typically recovered in <br />C 1 <br />(• association with extinct and modern forms of bison. Hunting techniques <br />included the methods mentioned above as well as the utilization of <br />artificially constructed bison traps (J. Jennings 1968: 105; Frison 1978: <br />150-191). Several Plano points have been found in northwestern Colorado, <br />but none were in context (Leach 1970: 42; Breternitz 1970: 106; B. Walton <br />1979: personal communication; C. Jennings and Ritcher 1979: 10 ). The <br />basal portion of a lanceolate projectile point, tentatively assigned to <br />the Plano tradition, was recovered in the Piceance Basin, which is located <br />southwest of the study area (C. Jennings 1974: 9-10). <br />Concurrent to the extinction or evolution of the Large game animals <br />.which constituted the basis of Paleoindian subsistence was a shift to <br />'dependence upon smaller game and a wide variety of plant resources. This <br />~~ period, termed the Archaic, extended from 5500 B.C. to approximately A.D. <br />500, when horticulture began to be practiced in some areas of northwestern <br />Colorado. The Archaic life style continued in many portions of the region <br />