Simon Pendleton, University of Colorado at Boulder, Boulder, CO, United States, Gifford H Miller, University of Colorado, INSTAAR and Geological Sciences, Boulder, United States, Nathaniel A Lifton, Purdue University, Department of Earth, Atmospheric, and Planetary Sciences, West Lafayette, IN, United States, Nicolas E. Young, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States and Robert S Anderson, INSTAAR and Department of Geological Sciences, Boulder, CO, United States