1. Department of Palaeontology , National Museum , Cirkusová 1740, 193 00, Prague 9 , Czech Republic
2. Department of Hydrogeology, Engineering Geology and Applied Geophysics, Faculty of Science , Charles University , Albertov 6, 128 43 Prague 2 , Czech Republic
3. Institute of Geology and Palaeontology, Faculty of Science , Charles University , Albertov 6, 128 43 Prague 2 , Czech Republic
4. West Bohemian Museum in Plzeň , Kopeckého sady 2, 301 00 Plzeň , Czech Republic