1. Department of Geological Sciences; University of Canterbury; Christchurch New Zealand
2. School of Environmental Sciences; University of Liverpool; Liverpool L69 3GP, UK
3. Ocean and Earth Science; National Oceanography Centre Southampton, University of Southampton; Southampton SO14 3ZH, UK
4. Department of Geology; University of Otago; Dunedin New Zealand
5. School of Geography; Environment, and Earth Sciences, Victoria University of Wellington; Wellington New Zealand
6. GNS Science; Lower Hutt New Zealand