1. Research School of Earth Sciences, The Australian National University, Mills Road, Canberra ACT 0200, Australia.
2. CSIRO Petroleum Resources, North Ryde, NSW 1670, Australia.
3. School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8W 2Y2, Canada.
4. Laboratoire CNRS UMR 5125 Paléoenvironnements and Paléobiosphère, Université Claude Bernard Lyon 1, Campus de la Doua, F-69622 Villeurbanne, France.
5. Department of Earth and Marine Sciences, Australian National University, Canberra ACT 0200, Australia.