MAHAN, Kevin H., Department of Geological Sciences, University of Colorado at Boulder, 2200 Colorado Ave, Boulder, CO 80309, mahank@colorado.edu, SCHULTE-PELKUM, Vera, Geological Sciences and CIRES, University of Colorado-Boulder, 2200 Colorado Ave, Boulder, CO 80309, BLACKBURN, Terrence J., Earth, Atmospheric, and Planetary Sciences and DTM (Carnegie), Massachusetts Institute of Technology, Building 54-1126, Cambridge, MA 02139, BOWRING, Samuel A., Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, and DUDAS, Frank, Earth, Atmospheric, & Planetary Sciences, MIT, Building 54-1124, Cambridge, MA 02139