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~~'' 16 <br />camps, coal mines, and Hispanic and Territorial Adobe buildings. <br />The architecture reflects the gradual shift in cultural <br />~7' influences prevalent in the region, from early Hispanic to Anglo- <br />,/ American and European styles. Of the 27 sites identified in the <br /> survey, three were determined to be individually eligible for <br /> nomination to the NRHP, six sites were considered to be eligible <br /> as contributing elements to a multiple resource district or <br />• thematic nomination, and 18 sites were judged to be not eligible <br /> for listing in the NRHP. <br /> <br /> CULTURE HISTORY SUMMARY <br /> The results of the preceding cultural resources investigations <br /> can be used to construct a culture history summary of the <br /> region. Prehistoric events are presented first, followed by <br /> major historical themes. This discussion is augmented by Figure <br /> 3 which graphically summarizes the cultural chronology of the <br /> Upper Purgatoire River Valley. This chart has been adapted from <br /> similar presentations in Bair (1977), Lutz and Hunt (1979), and <br /> Eddy, et al. (1982). <br />Prehistoric Patterns <br />In the early 198os, the Colorado Historical Society (CHS) <br />commissioned a group of studies on the prehistoric archaeology <br />of Colorado. The CHS document prepared !or the Colorado Plains <br />(Eighmy 1984) is the principal source used for the tollowinq <br />discussion of the regional prehistory. <br />Human groups have inhabited eastern Colorado for at least 12,000 <br />years. Information on the prehistoric utilization of eastern <br />Colorado before 10,000 years ago is scanty. This time period is <br />generally referred to as the Pre-Projectile Point stage, and <br />information about it comes primarily Prom three sites in <br />northeastern Colorado: the Selby, Dutton, and Lamb Springs Sites. <br />l Excavated by Dennis Stanford of the Smithsonian Institution, <br />these sites consist primarily of cultural materials associated <br />with such extinct megafauna as mammoth. The artifact assemblages <br />are notable for their absence of lanceolate projectile points <br />typify succeeding cultural periods. In contrast, these <br />assemblages are dominated by putative bone tools. <br />Following this somewhat murky stage is the Paleoindian stage, <br />lasting from 10,000 to 5,500 B.C. It is characterized generally <br />by the hunting of big game animals and is divided into three <br />periods: Clovis, Folsom, and Plano. <br />The Clovis period (10,000-9,500 B.C.) is distinguished by the <br />large, fluted Clovis point, often associated with the remains of <br />extinct mammoth. The type locality for Clovis points is the <br />Blackwater Draw locality in eastern New Mexico, but Clovis layers <br />have been discovered at the Dutton and Dent Sites in northeastern <br />