1 Department of Paleontology, San Diego Natural History Museum, San Diego, California, USA.
2 Center for American Paleolithic Research, 27930 Cascade Road, Hot Springs, South Dakota, USA.
3 Museum of Paleontology, University of Michigan, Ann Arbor, Michigan, USA.
4 Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, USA.
5 Centre for Archaeological Science, School of Earth and Environmental Sciences, Faculty of Science Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia.
6 Geosciences and Environmental Change Science Center, US Geological Survey, Denver, Colorado, USA.
7 Colorado Desert District, Stout Research Center, California Department of Parks and Recreation, Borrego Springs, California, USA.
8 Department of Earth Science, Adams State University, Alamosa, Colorado, USA.