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-7- <br />i • indicating, at least, a different type of plant utilization. Plano <br />dates overlap with Polsom dates, the earliest occurring about 8200 B.C. <br />and extending to about 5500 B.C. The Plano culture tools are also <br />found in association with extinct bison, which were killed in any of <br />the above mentioned ways or with the use of artificially constructed <br />bison traps (J. Jennings 1968: 105; Frison 1978: 150-191). Nineteen <br />site components containing Late Paleoindian (Plano) materials have been <br />reported within North Park by Lischka and Miller (1978: 13-15). <br />411th t'.~e extinction (or evolution) of the large game animals <br />hunted by the Paleoindians, a shift from dependence on large game to <br />smaller game and plant resources occurred. This period, called the <br />Archaic, exteaded from 55u0 b.C. to historic contact. Projectii~ <br />• points gradually became smaller during tie Archaic period, reflecting <br />changes in function from spear poiats to dart points to arrow points. <br />Four periods within the Archaic are discussed below. <br />The Early Plains Archaic Period (58CC-3000 B.C.) coincice<_ s:'_t^ <br />the Altithermal period on the Aigh Plains, during which tiae the climate <br />vas con4iderably dr'.er nnA warmer than before or after that oeriod. <br />No altithermal age sitar have been foun~ on tie F.igi clains t:, d;,te <br />(Frisen 19;8: bl). Benedict hypothesised that during the Altithereal <br />period [he -owland inhabitants of the region sought refuge at highzr <br />elevations (Benedict and Olson 1978: 179-180). Frison accepts that this <br />hypothesis may be partially correct, but also notes that 'it could be <br />due to the fact that evidence of Altitrermal sites has not vet been <br />• found (1973: 41). In any case, there is abundant evidence of AltitherWal <br />~ age sites frog the foothills to the high mountains, inclucing within <br />North Park (Lischka and Miller 1978: 14-15). <br />