1. School of Earth Sciences; University of Queensland; Brisbane Queensland Australia
2. Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
3. NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Universities Space Research Association; Columbia Maryland USA
5. NASA Johnson Space Center; Houston Texas USA
6. Department of Geosciences; State University of New York; Stony Brook New York USA
7. Geology and Physics/Astronomy Departments; Western Washington University; Bellingham Washington USA