1. Geological Museum, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark
2. Department of Geographical and Earth Sciences, University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow G12 8QQ, UK
3. Geology Section, Natural History Museum, University of Oslo, Postboks 1172 Blindern, N-0318 Oslo, Norway