1. GeoZentrum Nordbayern, Fachgruppe Paläoumwelt, University of Erlangen-Nürnberg, Erlangen, Germany
2. Department of Organismal Biology, Uppsala University, Uppsala, Sweden
3. Department of Geology, Tallinn University of Technology, Tallinn, Estonia
4. Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden