MARS. T.W. Haltigin, W.H. Pollard, G.R. Osinski, and P. Dutilleul, Department of Geography, McGill University, 805 Sherbrooke St. W., Montreal, QC, Canada, H3A 2K6 ([email protected], [email protected]), Departments of Earth Science / Physics & Astronomy, University of Western Ontario, 1151 Richmond St., London, ON, Canada, N6A 5B7 ([email protected]), Department of Plant Scien...