1. Department of Anthropology and Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA.
2. Crow Canyon Archaeological Center, Cortez, CO 81321, USA.
3. Department of Anthropology, Washington State University, Pullman, WA 99164, USA.
4. Montana Climate Office, Montana Forest and Conservation Experiment Station, University of Montana, Missoula, MT 59812, USA.