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The Garrett Allen Site is an extensive prehistoric campsite of the Late Middle Prehistoric period (1500 B.C. - A.D. 500) and Late Prehistoric period (A.D. 500-1700). It is deeply stratified, with a number of levels displaying a continuous deposition of artifacts. During the late 1960s and early 1970s, archaeologists working under Dr. George Frison conducted excavations. Bones of bison and numerous game animals, butchering tools, milling stones, projectile points and flakes were recovered indicating the site was an extensive butchering location.