Paul E Olsen, Columbia University of New York, Earth and Environmental Science, NY, NY, United States, Dennis V Kent, Rutgers University New Brunswick, EPS, New Brunswick, NJ, United States, Jacques Laskar, ASD/IMC, Paris, France, Christopher J Lepre, Lamont -Doherty Earth Observatory, Paleomagnetics Lab, Palisades, NY, United States, Roland Mundil, Berkeley Geochronology Ctr, Berkeley, CA, United States, Cornelia Rasmussen, Univerity of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Randall B Irmis, Natural History Museum of Utah, Salt Lake City, UT, United States, George E Gehrels, Univ Arizona, Tucson, AZ, United States, Dominique Giesler, University of Arizona, Tucson, AZ, United States, Sean Kinney, Columbia University of New York, Earth and Environmental Science, Palisades, NY, United States, John W Geissman, University of Texas at Dallas, Department of Geosciences, Richardson, TX, United States, Jessica Hope Whiteside, University of Southampton, Southampton, SO14, United Kingdom and William Parker, Petrified Forest National Park, Petrified Forest, AZ, United States