1. Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA
2. Department of Geology, University of Kansas, Lindley Hall, 1475 Jayhawk Boulevard, Room 120, Lawrence, Kansas 66045, USA
3. Department of Geosciences, Idaho State University, Pocatello, Idaho 83209-8072, USA
4. Department of Earth and Planetary Sciences, University of New Mexico, Northrop Hall, Albuquerque, New Mexico 87131, USA
5. Department of Geosciences, Fort Lewis College, 1000 Rim Drive, Durango, Colorado 81301, USA
6. Department of Geography-Geology, Illinois State University, Normal, Illinois 61790, USA
7. Department of Geology, University of Wisconsin–Eau Claire, 105 Garfield Avenue, Eau Claire, Wisconsin 54702, USA