Colleen A Dalton, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States, Zhitu Ma, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, United States, James B Gaherty, Columbia University in the City of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, Joshua B Russell, LDEO - Columbia University, Palisades, NY, United States, Greg Hirth, Brown Univeristy, Department of Earth, Environmental, and Planetary Sciences, Providence, RI, United States and Donald W Forsyth, Brown Univ, Providence, RI, United States