Nicholas Benetti Sullivan, University of Wisconsin Madison, Madison, WI, United States, Stephen Richard Meyers, Univ. of Wisconsin - Madison, Geoscience, Madison, WI, United States, Richard H Levy, GNS Science, Lower Hutt, New Zealand, Peter Sadler, University of California Davis, Department of Earth Sciences, Davis, CA, United States, James S. Crampton, GNS Science-Institute of Geological and Nuclear Sciences Ltd, Lower Hutt, New Zealand and Robert M Mckay, Victoria University of Wgtn, Wellington, New Zealand