Allison W Jacobel¹, Robert F Anderson², Timothy Herbert³, Sam Jaccard⁴, Jerry F McManus⁵, Frank J Pavia² and Gisela Winckler⁶, (1)Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, (2)Lamont-Doherty Earth Obs, Palisades, NY, United States, (3)Brown University, Earth, Environmental and Planetary Sciences, Providence, RI, United States, (4)University of Bern, Bern, Switzerland, (5)Columbia U. / LDEO, Palisades, NY, United States, (6)Columbia University, Lamont-Doherty Earth Observatory, New York, NY, United States