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<br /> <br />pro.fectile 1_,olnts o~it)-, cotlCa'•>e base=_. and basal grinding, and the <br />butchered remains of extinct bison. <br />- Plano Period: ca. 10,200 to 7500 B.P. (8200 t^ 5500 <br />B.C.). This period includes a number of regional varieties based <br />on technological differences in tool assemblages. The common <br />denominator among them all is large, finely worked projectile <br />points and the remains of bath extinct and modern forms of bison. <br />Archaic Stage: 7500 t^ 1800 B.P. (5500 B.C. to A.D. 200). <br />Coinciding with the Altithermal climatic episode, a general <br />period of warmer and drier weather, the beginning of the Archaic <br />Stage signals a shift in emphasis Fcom big-game hunting to more <br />generalized hunting-gathering and greater reliance on plant foods <br />and smaller game animals. Lithic assemblages are characterized <br />by large, side-notched projectile points with tangs, and by the <br />increasing numbers of groundstone implements. <br />- Early Archaic Period: ca. 7500 to 5000 B.P.C5500 t^ 3000 <br />B.C.). The Early Archaic Period spans the Altithermal, and sites <br />on the Plains are scarce; a common interpretation of the scarcity <br />of sites is that increasing temperatures and dryness forced an <br />abandonment of the region in favor of the cooler mountains and <br />other refuges (Eighmy 19B't). Early Archaic points tend to be <br />large with corner notches ^r shallow side notches, and <br />groundstone begins to appear. <br />- Middle Archaic Period: ca. 5000 to 3500 B.P. (3000 t^ <br />1500 B.C.). With the end of the Altithermal, the number of sites <br />on the Plains increases dramatically (Prison 1978). Hearths and <br />possible roasting pits are common. Lithic assemblages are <br />S <br />