1. Department of Geology University of Georgia 210 Field Street Athens Georgia 30602 USA
2. Department of Geological Sciences University of Cape Town Rondebosch 7701 South Africa
3. Department of Geoscience University of Nevada, Las Vegas 4505 S. Maryland Pkwy Las Vegas Nevada 89154 USA
4. Department of Earth and Planetary Sciences Rutgers University 610 Taylor Rd Piscataway New Jersey 08854 USA
5. Department of Earth and Planetary Sciences The American Museum of Natural History 200 Central Park West New York New York 10024 USA
6. Lunar and Planetary Institute 3600 Bay Area Blvd Houston Texas 77058 USA