1. Institute of Geology Adam Mickiewicz University B. Krygowskiego 12 Poznań 61‐680 Poland
2. Nature Research Centre Akademijos 2 Vilnius LT‐08412 Lithuania
3. Marine Research Institute Klaipėda University Universiteto av. 17 Klaipėda LT‐92294 Lithuania
4. Faculty of Geology University of Warsaw Żwirki i Wigury 93 Warsaw 02‐089 Poland
5. British Geological Survey The Lyell Centre Research Avenue South Edinburgh EH14 4AP UK
6. Department of Geoscience Aarhus University Høegh‐Guldbergs Gade 2 Aarhus C DK‐8000 Denmark
7. Faculty of Earth Sciences Nicolaus Copernicus University Lwowska 1 Toruń 87‐100 Poland
8. Lithuanian Geological Survey S. Konarskio 35 Vilnius LT‐03123 Lithuania