1. Natural History Museum of Utah, University of Utah, Salt Lake City, UT 84108, USA.
2. Department of Anthropology, University of Utah, Salt Lake City, UT 84112, USA.
3. Institute of Human Origins and School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85282, USA.
4. Department of Anthropology, University of Massachusetts, Amherst, MA 01003, USA.
5. Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.
6. Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA.