1. Department of Geological Sciences and Bolin Centre for Climate Research; Stockholm University; Stockholm SE-10691 Sweden
2. Division of Environmental Ecology; Department of Environmental Sciences; University of Helsinki; Niemenkatu 73 Lahti FIN-15140 Finland
3. Division of Biology and Paleo Environment; Lamont-Doherty Earth Observatory of Columbia University; 61 Route 9W - PO Box 1000 Palisades NY 10964-8000 USA
4. Environmental Change Research Unit; Department of Environmental Sciences; University of Helsinki; P. O. Box 65 Helsinki FIN-00014 Finland
5. Department of Geology; Lund University; Sölvegatan 12 Lund SE-22362 Sweden
6. Department of Geography; Swansea University; Singleton Park Swansea SA2 8PP, UK
7. Chrono Centre; School of Natural and Built Environment; Queen's University; Belfast BT7 1NN UK