NANCE, John Robert, Geology, University of Maryland - College Park, College Park, MD 20742, jnance@umd.edu, ARMSTRONG, John, Geophysical Laboratory and NASA Astrobiology Institute, Carnegie Institution of Washington, 5251 Broad Branch rd NW, Washington, DC 20015, CODY, George D., Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd, NW, Washington, DC 20015, FOGEL, Marilyn, Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, HAZEN, Robert M., Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington DC, 20015, and STEELE, Andrew, Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, DC 20015