PLANUM: INSIGHTS INTO THE SEDIMENTARY ROCK CYCLE ON MARS. Scott M. McLennan, R. E. Arvidson, B. C. Clark, M. P. Golombek, J. P. Grotzinger, B. L. Jolliff, A. H. Knoll, S. W. Squyres, N. J. Tosca and the Athena Science Team. Dept. Geosciences, State University of New York, Stony Brook, NY, 11794-2100 ( Scott.McLennan@sunysb.edu ); Dept. Earth & Planetary Sciences, Washington University, St. Louis, MO, 63130; Lockheed Martin Corporation, Littleton, CO, 80127; Jet Propulsion Lab, California Institute of Technology, Pasadena, CA; Div. Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125; Dept. Organismic & Evolutionary Biology, Harvard University, Cambridge, MA, 02138; Dept. Astronomy, Cornell University, Ithaca, NY, 14852.