PENMAN, Donald, Department of Geosciences, Utah State University, Logan, UT 84341, KIRTLAND TURNER, Sandra, Department of Earth Sciences, University of California, Riverside, 900 University Ave., Riverside, CA 92521, RIDGWELL, Andy, Department of Earth and Planetary Sciences, University of California, Riverside, 900 University Ave., Riverside, CA 92521, SCHER, Howie D., School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC 29208 and HULL, Pincelli M., Department of Earth and Planetary Sciences, Yale University, 210 Whitney Ave, New Haven, CT 06511