1. Division of Geological and Planetary SciencesCalifornia Institute of Technology Pasadena CA USA
2. Now at Shell International Production and Exploration Houston TX USA
3. Department of GeologyUniversity of Otago Dunedin New Zealand
4. Department of Paleontology and Environmental ChangeGNS Science Lower Hutt New Zealand
5. Department of Earth SciencesUniversity of Southern California Los Angeles CA USA