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I~`~ 12 <br />He also resurveyed the Trinidad Lake Project area to the 6400 <br />contour line, well above the flood-pool margins. <br />Ireland was replaced in 1975 by Gerald Bair. Bair resumed work <br />at Trinidad Lake, excavating sites 5LA1416B and 5LA1211 during <br />the 1975-1977 field seasons. He reorganized the site numbering <br />system to conform with the universal Smithsonian System and <br />presented the first cultural-temporal synthesis for the region <br />(Bair 1977). <br />Bair resigned in 1980 and was replaced by Caryl Wood. She <br />I_~ completed the investigations at 5LA1416B and 5LA1211 and finished <br />the summary report of that research (Wood and Bair 1980). <br />The most comprehensive and areally extensive archaeological <br />investigations which have been completed to date in the region <br />are those conducted by the University of Northern Colorado (UNC). <br />The Office of Public and Contract Archaeology at UNC, under the <br />direction of Bruce J. Lutz, completed a sample-oriented survey <br />of approximately 10,080 acres on the Park Plateau in 1977 and <br />1978 (Lutz and Hunt 1979). A total of 63 quarter-section sample <br />units were surveyed: 56 between the Purgatoire and Apishapa <br />Rivers, four south of the Purqatoire River, and three north of <br />the Apishapa River. The principal goal of the project was to <br />make an objective estimate of the nature and distribution of <br />~~' cultural resources within the project area by identifying and <br />evaluating sites within a portion of the larger area. They had <br /> four secondary objectives: delineate a regional chronology, <br /> define patterns in aboriginal settlement and subsistence, define <br /> changes in those patterns, and test the food crisis hypothesis <br /> of Bark Cohen <br />introduction oP (1977) as a <br />horticulture satisfactory explanation of the <br />in the area <br /> . <br />Their survey resulted in the discovery and recordation of 212 <br />prehistoric sites (historic sites were not reported) for a site <br />= ~ density of 1 site per 47.55 acres. The survey area included <br />three ecologic zones or strata. Each stratum was found to have <br />,` substantially different site densities, the differences seemingly <br />' attributable to elevation. The Pinyon/Juniper-Oakbrush zone, at <br />?~' the lowest elevation, had the greatest number of sites, 1 site <br />'~~ for every 32.41 acres. The highest stratum, the Ponderosa Pine- <br />Douglas Fir zone, had the least number of sites, 1 site per <br />- 195.56 acres. The Ponderosa Pine zone, midway between these two <br />extremes, was also intermediary in site density, 1 site per 72.73 <br />ff acres. <br />L.< <br />Lutz and Hunt (1979) predicted that aboriginal settlement <br />patterns would be composed of two general site classes: short- <br />term, specialized activity areas and base camps. The short-term <br />`~ sites are small, contain a small number of tool types, and are <br />oriented to the accomplishment of a specific task such as hunting <br />and vegetal processing. During the early spring, such task <br />`'- specific sites are located in the lower elevations of the <br />• Pinyon/Juniper zone. During the summer, activities are moved to <br />the higher environmental zones. Base camps are larger, contain <br />