1. Institute of Petrology and Structural Geology; Charles University; Albertov 6, 128 43 Prague Czech Republic
2. Institute of Geology and Paleontology; Charles University; Albertov, 128 43 Prague Czech Republic
3. Department of Earth Science and Centre for Geobiology; University of Bergen; N-5020 Bergen Norway
4. Institute of Geology; Academy of Sciences of the Czech Republic; Rozvojová 269, 165 00 Prague Czech Republic
5. Institute of Earth Sciences; University of Graz; Universitätsplatz 2, 8010 Graz Austria