1. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
2. Environment and Parks, Government of Alberta, Edmonton, Alberta T5J 5C6, Canada
3. Department of Geological Sciences, University of Florida, Gainesville, Florida 32611, United States
4. Land Use and Environmental Change Institute, University of Florida, Gainesville, Florida 32611, United States
5. Environment and Parks, Government of Alberta, Calgary, Alberta T2L 2K8, Canada
6. Department of Anthropology, Montclair State University, Montclair, New Jersey 07043, United States