1. 1 Department of Geology and Geophysics, University of Wyoming, Dept. 3006, 1000 E. University Ave., Laramie, WY 82071-2000
2. 2 Department of Earth and Planetary Sciences, University of New Mexico, Northrop Hall, 221 Yale Blvd. NE, Albuquerque, NM 87131-0001
3. 3 Washington Geological Survey, 1111 Washington St. SE, MS 47007, Olympia, WA 98504-7007