1. Department of Earth Sciences; University of Oxford; Oxford UK
2. Now at Department of Earth Sciences; Royal Holloway University of London; Egham Surrey UK
3. Now at Institute of Earth Sciences, Géopolis; University of Lausanne; Lausanne Switzerland
4. Camborne School of Mines and Environment and Sustainability Institute; University of Exeter; Penryn UK
5. Shell International Exploration & Production B.V; Rijswijk GS the Netherlands
6. Now at Shell R&D Houston; Vashon WA USA
7. Shell International Exploration and Production Inc.; Houston TX USA