TIMMONS, J. Michael, New Mexico Bureau of Geology and Mineral Resources, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, FLETCHER, Kathryn, Department of Earth and Environmental Sciences, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, BLOCH, John D., Dept. of Earth & Planetary Sciences, Univ. of New Mexico, Northrop Hall, Albuquerque, NM 87131, KARLSTROM, Karl, Earth and Planetary Sciences, University of New Mexico, Northrop Hall, MSCO3-2040; 1 University of New Mexico, Albuquerque, NM 87131-0001, HEIZLER, Matthew T., New Mexico Bureau of Geology & Mineral Resources, New Mexico Institute of Mining & Technology, Socorro, NM 87801, GEHRELS, George, Geosciences, Univ of Arizona, Tucson, AZ 85721, BOWRING, Sam, Dept. of Earth, Atmospheric, and Planetary Sciences, Mass Inst. of Technology, 77 Massachusetts Ave, Cambridge, MS 02139 and CROSSEY, Laura, Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, mtimmons@nmbg.nmt.edu, mtimmons@nmbg.nmt.edu