FINZEL, Emily, University of IowaEarth & Environmental Sciences, 115 Trowbridge Hall, Iowa City, IA 52242, ENKELMANN, Eva, Earth, Energy and Environment, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada, RIDGWAY, Kenneth, Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, TROP, Jeffrey M., Department of Geology and Environmental Geosciences, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837 and MCCLELLAND, Bill, Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA 52242