1. Nicolaus Copernicus Museum; ul. Katedralna 8 14-530 Frombork Poland
2. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California 90095-1567 USA
3. Institute of Geology; Adam Mickiewicz University; ul. Maków Polnych 16 Poznań 60-606 Poland
4. Institute of Geological Sciences; University of Wrocław; ul. Cybulskiego 30 50-205 Wrocław Poland
5. Faculty of Earth Sciences; University of Silesia; ul. Będzińska 60 41-200 Sosnowiec Poland