Fossil Bison and Artifacts From an Early Altithermal Period Arroyo Trap in Wyoming

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Abstract
The Hawken site is a steep-sided arroyo into which small groups of bison were driven and slaughtered. The bison, which date about 4500 B.C. during the Altithermal period, are an extinct variant (B. bison occidentalis) and are morphologically intermediate between B. bison antiquus and B. bison bison. The projectile points are in the Altithermal period Side-Notched tradition and the butchering tools are similar to those found in many bison kill sites from the Paleoindian to the end of the Late Prehistoric period. Continuity of bison procurement methods from Paleoindian through Altithermal and into post-Altithermal times is suggested.