1. Palaeoecology, Laboratory of Palaeobotany and Palynology, Institute of Environmental Biology; Utrecht University; Utrecht Netherlands
2. Center for Marine Environmental Sciences; Bremen University; Bremen Germany
3. Department of Marine Biogeochemistry and Toxicology; Royal Netherlands Institute for Sea Research; Den Burg, Texel Netherlands
4. Institute for Chemistry and Biology of the Marine Environment; University of Oldenburg; Oldenburg Germany
5. Department of Earth Sciences; Utrecht University; Utrecht Netherlands