1. Geological Survey of Finland (GET); P.O. Box 96; (Betonimiehenkuja 4),; FI-02151; Espoo; Finland
2. Scripps Institution of Oceanography; University of California at San Diego; 9500 Gilman Drive,; La Jolla; California; 92093-0225; USA
3. University of Copenhagen, Geological Museum; Oster Voldgade 5-7,; DK-1350; Copenhagen; Denmark
4. University of Helsinki; Gustaf Hällströmin katu 2,; P.O. Box 64,; FI-00014; Helsinki; Finland