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Generally, Paleoindian lifeways focused upon the hunting of. large <br />. game animals, many of which (e.g., mammoth and large bison) became <br />extinct at the end of the Pleistocene Epoch. The Paleoindian Period/ <br />Tradition is divided into three major complexes: Clovis, Folsom, and <br />Plano. The hallmarks of each complex are distinctive lanceolate projec- <br />tile points (e.g., Clovis, Folsom, and Hell Gap types, to name but a <br />few). None of the projectile point types has been found in or near the <br />project area. A possible Paleoindian bison kill (5MF969) has been <br />reported in the Axial Basin (Piontkowski 1981). At this site, two <br />butchered long bones and a vertebral fragment of an extinct species of <br />bison (Bison antiquus) have been recovered from a stream cutbank approx- <br />imately 6.5 km northwest of the project area. No artifacts were recov- <br />ered but the long bones exhibit butchering cut marks. <br />Following the Pleistocene, the climate gradually became warmer and <br />drier, reaching a thermal maximum at approximately 6000 years B.P. <br />(Antevs 1955). Many Pleistocene animals became extinct. These inter- <br />related events had a demonstrable effect upon the Paleoindians who <br />derived a large share of their diet from the hunting of these animals. <br />Their adaptive response to these changes was to employ a "broad spectrum <br />exploitation strategy" (Grady 1984:25), generally referred to as an <br />Archaic lifestyle. The hunting and gathering of a greater diversity of <br />animals and plants was adopted. The increased emphasis upon plant <br />resources was marked, as evidenced by the appearance of roasting pits <br />and groundstone artifacts. These Archaic peoples followed a pattern of <br />seasonal transhumance in a region, moving from one area to the next <br />• during the year as exploitable resources became available. Seasonal <br />strategies suggested for the area include a lowland, riverine occupation <br />in early spring, transferring to a high mountain area for game and, when <br />the snow cover allows, returning again to lowland resources (pinyon <br />nuts, juniper berries) when snow falls in the autumn (Grady 1984:29). <br />The entire period is viewed as a very conservative one in which <br />changes occurred slowly (Jennings 1978) and the same lifestyle existed <br />for thousands of years, from approximately 8000 to 1500 BP (Prison <br />1978). The period is differentiated from the previous Paleoindian era <br />by a change in projectile point types, a diversification of tool types, <br />introduction of the mono and metate and exploitation of a wide range of <br />flora and fauna. <br />The Archaic Period has been divided into sub-periods or phases <br />based upcn clusters of radiocarbon dates from controlled excavations or <br />distinctive projectile point styles. Temporal units defined for the <br />Archaic Period on the Northwestern Plains and Northern Colorado Plateau <br />are shown in Figure 2.2. Chronological and other minor differences not- <br />withstanding, general patterns are evident in both regions: diminution <br />in the size of projectile points, greater reliance upon plant foods, and <br />population increase. These changes herald the adoption of the bow and <br />arrow and the replacement of a strictly hunting and gathering subsis- <br />tence strategy with a Formative lifestyle which was more sedentary and <br />founded upon the cultivation of various domesticated plants. This <br />. horticultural "(r)evolution" was not universal throughout the western <br />United States, however. Many aboriginal groups, particularly those on <br />12 <br />