1. Department of Geosciences University of Nevada-Las Vegas Las Vegas NV 89154 USA unlv.edu
2. Department of Geosciences Utah State University Logan UT 84322 USA usu.edu
3. Department of Earth and Environmental Sciences Weber State University Ogden UT 84408 USA weber.edu
4. Department of Geosciences University of Arizona Tucson AZ 85721 USA arizona.edu
5. Department of Geological Sciences University of Colorado Boulder Boulder CO 80309 USA colorado.edu