Affiliation: | Department of Geological Engineering and Sciences, Michigan Technological University, 1400;Townsend Drive, Houghton, MI 49931–1295, USA. E-mail: ;Institute of Geology, Academy of Sciences, Rozvovova 135, 165 00 Praha 6, Czech Republic ;Moravian Museum, Zelny Trh 6, 659 37 Brno, Czech Republic |