Fossil Bison and Artifacts from The Mona Lisa Site, Calgary, Alberta

Abstract

In November, 1968, salvage excavations at the site of an art gallery under construction in urban southwest Calgary, Alberta, Canada, revealed a Paleo-Indian bison kill. The single kill level lay at a depth of more than 250 em. in flood plain deposits of the Bow River, now flowing more than a mile north of the site. The bone bed was overlain by a thick deposit of Mazama Ash (6600 years B.P.). A bone radiocarbon date of 8080 ± 150 years B.P. (G.S.C.-1209) was obtained. Intermittent pedigenesis and fineness of enclosing sediments indicate an overbank flood plain situation for the kill; evidently the site area was repeatedly flooded, probably seasonally, before and after the kill episode. No evidence of a jump-off is present, although this is inconclusive at present. In the 30 square meters excavated at Locality A there was evidence for three activity loci relating to processing of carcasses. The lithic sample includes only crude butchering tools, precluding cultural assignment. Several bone tools, most of them fashioned from tibiae, appear to have been used as expedient and expendable butchering tools at the kill. Some modification of the butchering of lower limbs is noted, apparently to facilitate the production of the bone tools.