1. Dept. of Geoscience, University of Nevada, Las Vegas, 4505 South Maryland Parkway, Las Vegas, Nevada 89154-4010, USA
2. Dept. of Geology and Environmental Science, University of Pittsburgh, 4107 O'Hara St., Pittsburgh, Pennsylvania 15260, USA
3. Institute of Geosciences, Universidade de Brasília, Darcy Ribeiro Campus – ICC Central Wing, CEP 70.910-900, Brasília DF
4. Dept. of Geosciences, The University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA
5. Dept. of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada