MISSION. D.F. Blake, D.Vaniman, R. Anderson, D. Bish, S. Chipera, S. Chemtob, J. Crisp, D. J. DesMarais, R. Downs, J. Farmer, M. Gailhanou, D. Ming, D. Morris, E. Stolper, P. Sarrazin, A. Treiman, A. Yen. Exobiology Branch, MS 239-4, NASA Ames Research Center, Moffett Field, CA 94035-1000; dblake@mail.arc.nasa.gov; EES-6, MS D462, Los Alamos National Laboratory, Los Alamos, NM 86545; Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109; Dept. of Geological Sciences, Indiana University, 1001 East Tenth St., Bloomington, IN 47405; Chesapeake Energy Corporation, 6100 N. Western Ave., Oklahoma City, OK 73118; Dept. of Geological Sciences, California Inst. of Technology, Pasadena, CA 91109; Department of Geosciences, Gould-Simpson Building, University of Arizona, Tucson, AZ 85721; Dept. of Geological Sciences, Arizona State University, P.O. Box 871404, Tempe, AZ 85287; IM2NP, UMR 6242 CNRS, Universite Paul Cezanne, Aix-marseille III, Marseille, France; Astromaterials Branch, NASA Johnson Space Center, Houston, TX 77058; inXitu, Inc., 2551 Casey Ave., Suite A, Mountain View, CA 94043; Lunar and Planetary Institute, 3600 Bay Area Blvd., Houston, TX 77058-1113.