1. Institute of Geological Sciences, University of Wrocław, Pl. Maksa Borna 9, Wrocław 50-205, Poland; Department of Geology and Mineralogy, Vilnius University, M. K. Čiurlionio 21/27, 03101 Vilnius, Lithuania;
2. Institute of Geological Sciences, University of Wrocław, Pl. Maksa Borna 9, Wrocław 50-205, Poland;
3. Department of Nuclear Research, Center for Physical Sciences and Technology, 10221 Vilnius, Lithuania;
4. Laboratory of Bedrock Geology, Nature Research Centre, Akademijos str. 2, 08412 Vilnius, Lithuania;
5. Department of Geology and Mineralogy, Vilnius University, M. K. Čiurlionio 21/27, 03101 Vilnius, Lithuania;