1. Department of Palaeobiology and Palaeoecology; Institute of Geology AS CR; Praha 6 165 02 Czech Republic
2. Division of Regional Geology of Sedimentary Formations; Czech Geological Survey; Klárov 3/131 Praha 1 118 21 Czech Republic
3. School of Earth and Environmental Sciences; University of Portsmouth; Burnaby Road Portsmouth PO1 3QL UK