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• earliest site for which a controlled study has been made. Earlier <br />sites, as yet unrecorded, may exist. As the Yampa River basin is <br />largely unexplored archaeologically, additional information may be <br />found to document occupation in the eastern portion of the basin at <br />this time or earlier. <br />Middle Prehistoric Period: 7000 BC-AD 900 <br />The Middle Prehistoric Period, according to Molloy (1958) is re- <br />presented by a change in projectile point styles from the Early Pre- <br />historic Period. The earlier period is characterized by large, lanceo- <br />late, concave based projectiles, often fluted. The Middle Prehistoric <br />shifts to smaller types. Mulloy subdivides this period into the Early <br />Middle and Late Middle Periods on the basis of differing projectile <br />point types. The earlier types tend to have lanceolate blades and con- <br />cave, flat, or convex bases; or stemmed lanceolate blades with flat, <br />concave or indented bases (1958:150). The later forms include corner <br />notched triangular projectiles with concave or flat bases (zbia,:151). <br />Only one site, 5RT22 in Tract 7, yielded a projectile which could <br />be assigned to the Early diddle Period on the basis of Mulloy's list <br />of diagnostic traits. Our Type IA projectile possesses the attributes <br />outlined by Mulloy, and is almost identical to specimens from Level I <br />at Signal Butte (Strong 1935: Plate 25), which have subsequently been <br />radiocarbon dated between 2600 and 1450 BC (Neuman 1967:477). <br />Two isolated finds, Types II and IVC, are almost certainly represen- <br />tatives of Duncan and yanna types (Wheeler 1954, Molloy 1954). These two <br />types are quite similar and often occur together. At the Long Creek site, <br />• <br />