1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
2. Department of Earth and Planetary Sciences, Washington University, Saint Louis, Missouri, USA.
3. Department of Geological Sciences, Indiana University, Bloomington, Indiana, USA.
4. Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA.
5. Geophysical Laboratory, Carnegie Institution of Washington, Washington DC, USA.
6. Exobiology Branch, NASA Ames Research Center, Moffett Field, California, USA.
7. Université de Lyon, CNRS UMR 5276, ENS de Lyon 69364 Lyon Cedex 07, France.
8. Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
9. Departments of Earth and Planetary Sciences and Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA.
10. Geology Department, University of California Davis, Davis, California, USA.