1. Department of Watershed Sciences, Utah State University, 5210 Old Main Hill, NR 138, Logan, Utah 84322, USA
2. Department of Geological Sciences, The University of Texas at Austin, 2305 Speedway, Stop C1160, Austin, Texas 78712, USA
3. Department of Earth and Environmental Sciences, Tulane University, 101 Blessey Hall, New Orleans, Louisiana 70118, USA
4. Department of Geology, College of William and Mary, P.O. Box 8795, Williamsburg, Virginia 23187, USA
5. Department of Geological Sciences, University of Colorado–Boulder, Campus Box 399, 2200 Colorado Avenue, Boulder, Colorado 80309, USA