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Recreation Area near Gunnison (Cassels 1997) and at the Hill Horn and Granby sites near <br />the town of Granby (Wheeler and Martin 1982). The Curecanti structures date between <br />3400 and 1500 BC (Cassels 1997: 106-108). The Granby structures date to 2500 BC and the <br />Hill Horn structures may date between to as early as 7000 and as late as 2500 BC (Wheeler <br />and Martin 1982:24). <br />Comparable to the UBL/WIC/REX projects’ data (Figure 4) is that derived during <br />the Collbran Pipeline Project conducted in west-central Colorado in the De Beque-Collbran <br />area. During the 2009 field season, three pit structures were discovered during <br />archaeological monitoring (Conner et al. 2013a). At site 5ME16789, a house-pit floor was <br />found near the present ground surface and was dated 5990 ± 40 BP ([Beta-263486] cal 4990 <br />- 4790 BC). At the same site, a pithouse was identified at a stratigraphically higher level – <br />although about a meter lower in the ground – that dated 4600 ± 40 BP ([Beta-263487] cal <br />3500 - 3190 BC). Another pithouse was identified during the monitoring project at <br />5ME16786. It dated 2760 ± 70 BP ([Beta-263486] cal 1080 - 800 BC), and is directly <br />comparable to a pithouse excavated in the early 1980's at 5GF126, located in what in now <br />the town of Battlement Mesa (Conner and Langdon 1987). Notably, the use of house pits <br />was not observed for the period 3600-2500 BP in northwest Colorado during the <br />UBL/WIC/REX projects, but such is known to occur in the Grand Valley area (near De <br />Beque and Parachute) during the period ca. 3000-2700 BP (Conner et al. 2013a). <br />Figure 4. Number of dated UBL/WIC/REX projects house pits by cal BP millennia <br />(Metcalf and Reed 2011:131, Figure 59). <br />27