1. Department of Anthropology, Washington State University, Pullman, WA 99164–4910, USA.
2. Crow Canyon Archaeological Center, Cortez, CO 81321, USA.
3. CyberGIS Center for Advanced Digital and Spatial Studies, National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
4. Department of Geography, The Ohio State University, Columbus, OH 43210, USA.
5. School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287, USA.
6. Santa Fe Institute, Santa Fe, NM 87501, USA.