Richard J Walker, University of Maryland College Park, Department of Geology, College Park, MD, United States, Andrea Mundl-Petermeier, University of Vienna, Vienna, Austria, Rebecca A. Fischer, Harvard University, Cambridge, MA, United States, Vedran Lekic, University of Maryland, Department of Geology, College Park, MD, United States, Matthew G Jackson, University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States, Mark D Kurz, WHOI, Woods Hole, MA, United States and Mary Horan, Carnegie Inst Washington, Department of Terrestrial Magnetism, Washington, DC, United States