1. Eobiology Branch, NASA Ames Research Center, Moffett Field, CA 94035, USA.
2. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
3. Astromaterials Research and Exploration Science Division, NASA Johnson Space Center, Houston, TX 77058, USA.
4. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK.
5. Planetary Science Institute, Tucson, AZ 85719, USA.
6. Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA.
7. Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA.
8. Globe Institute, University of Copenhagen, Copenhagen, Denmark.
9. Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
10. Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.
11. Jacobs Technology–Jacobs JETS Contract, Astromaterials Research and Exploration Science Division, at NASA Johnson Space Center, Houston, TX 77058, USA.
12. Lunar and Planetary Institute, Universities Space Research Association, Houston, TX 77058, USA.
13. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
14. Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
15. Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
16. Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA 94720, USA.
17. U.S. Geological Survey, Astrogeology Science Center, Flagstaff, AZ 86001, USA.
18. Department of Earth, Environmental Sciences and Planetary Sciences, Brown University, Providence, RI 02912, USA.