1. Laboratory of Palaeobotany and Palynology; Utrecht University; Utrecht Netherlands
2. Department of Marine Biogeochemistry and Toxicology; Royal Netherlands Institute for Sea Research (NIOZ); Texel Netherlands
3. Institute for Chemistry and Biology of the Marine Environment (ICBM); Oldenburg University; Oldenburg Germany
4. U.S. Geological Survey; Reston Virginia USA
5. Norwegian Polar Institute; Polar Environmental Centre; Tromsø Norway
6. Graduate School of Oceanography University of Rhode Island; Narragansett Rhode Island USA
7. Department of Earth Sciences; Utrecht University; Utrecht Netherlands