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9x <br />~~ 13 <br />a greater diversity of tool types, and may have structural <br />remains. They are located in the Pinyon/Juniper zone during the <br />~- fall to Spring months. <br />Analysis of the survey results determined that four, rather than <br />two, site types were present but that these four could be <br />subsumed, two each, under the original two site classes. That <br />is, the short-term, specialized activity areas include ephemeral <br />and restricted sites, while base camps include minor and <br />sustained camps. These four site types represent points along <br />r., several continua, such as site size, number of activities <br />represented, presence of features, and location vis a vis a water <br />source. For example, ephemeral sites are smallest in size, <br />directed toward a single activity, have no features, and are <br />located close to water. At the other end of the spectrum, <br />sustained camps are the largest of all site types, supported <br />multiple activities, usually contained features, and are located <br />closest to water. The characteristics of the two other site <br />types fall between these extremes. <br /> The data seemed to support generally their hypothesis that the <br /> different site types were established in specific ecological <br /> zones at different times of the year. The only exception they. <br /> noted was that base camps are distributed somewhat evenly within <br /> the three zones. They surmise that group mobility was more <br /> limited in this region. <br /> Finally, UNC attempted to test the validity of Cohen's (1977) <br /> hypothesis that the shift from gathering-hunting to a <br /> horticultural/agricultural system is precipitated by population <br /> pressure. They opined that the eflects of population pressure <br /> could be observed in the archaeological record by an increase <br /> over time in at least three elements: the total number of sites, <br />~-. the size of base camps, and the number of structures per site of <br />K, the number of rooms per structure. Having to rely upon the <br /> incomplete information provided by surface sites, and lacking <br /> precise chronological controls, the investigators were hampered <br /> from fully testing Cohen's hypothesis. They do note, however, <br /> that site size increase through time as predicted. <br />More recently, the Colorado Department of Highways (CDOH) has <br />completed archaeological investigations east of the project <br />area. Plans to widen and straighten Colorado Highway 12 west of <br />Trinidad Lake required that a corridor 200 feet wide following <br />the proposed route change be inspected for cultural resources. <br />This inspection was accomplished by CDOH in increments of <br />approximately 4-5 miles. Two segments have been surveyed to date <br />and the remainder will be examined over the next few years (J. <br />Gooding, personal communication 1983). <br />~~` The first survey was performed in January 1980 along a segment <br />~a extending from Tijeras Plaza to a point (Milepost 58.4) near <br />Valdez (Blair 1980). Twenty-two prehistoric sites were recorded. <br />Most of these are lithic scatters, some having ground stone. The <br />