1. Department of Geoscience and Department of Archaeology, University of Calgary, 2500 University Dr. N.W., Calgary, AB T2N 1N4, Canada.
2. Box 1147, Cardston, AB TOK 0Y0, Canada.
3. Steppe Consulting Services, 264 Edgebrook Park, Calgary, AB T3A 5T7, Canada.
4. Department of Archaeology, University of Calgary, 2500 University Dr. N.W., Calgary, AB T2N 1N4, Canada.