Yuyu Li, United States, Kurt S Panter, Bowling Green State University, Bowling Green, OH, United States, John L Smellie, University of Leicester, Leicester, United Kingdom, Jerzy Blusztajn, WHOI, Department of Marine Geology and Geophysics, Woods Hole, MA, United States, Michael J Spicuzza, University Of Wisconsin Geoscience, Madison, WI, United States and John W Valley, Univ Wisconsin Madison, Madison, WI, United States