Jolanta Iwanczuk (Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975 Warszawa,), Daniela Rehakowa (Comenius University, Faculty of Science, Dept. of Geology and Palaeontology), Jacek Grabowski (Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975 Warszawa,), Hans-Jurgen Gawlick (Department of Applied Geosciences and Geophysics, Montanuniversitaet Leoben), Oliver Kirsche (Department of Applied Geosciences and Geophysics, Montanuniversitaet Leoben), Krystian Wojcik (Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975 Warszawa, Poland)