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The results of the west-central Colorado Coai <br /> Lease Survev support the hypothesis of a hunter-gather <br /> economic pattern in this area . Cultural remains were found <br /> representative of late Paieo-Indian (8000 B . C . ) on through <br /> Historic times . Eleven time periods were defined (eight <br /> separate periods and three transitional ones) based on <br /> Wyoming projectile point typologies (Frison 1974 , i978) . <br /> Buckles (1971) had previously identified twelve different <br /> phases within the Uncompahgre Complex encompassing the same <br /> time span. Each phase reflects specific responses and <br /> adaptations to outside influences and the changing environment <br /> although the hunter-gatherer lifestyle remained comparatively <br /> unchanged until the beginning of intensive contact with <br /> Europeans . The Uncompahgre Complex is thought by some <br /> authors to be the progenitor of the Ute Culture (Buckles, <br /> 1971) . <br /> The physical expression of the various exploita- <br /> tion patterns results in the different types of archeological <br /> sites and artifacts found in the west-central Colorado area . <br /> Sites are generally defined by five categories : lithic <br /> site , rock shelter , rock art , wickiups , and dryiaid masonry. <br /> Within these five categories are a number of subtypes which <br /> reflect the various activities taking place . Specific <br /> artifact types are used to determine the functional basis of <br /> a site to differentiate among the different cultural phases <br /> and provide chronological sequences . Certain artifact <br />