1. Department of Geology, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
2. Department of Earth Sciences, Palaeobiology, Uppsala University, Uppsala, Sweden
3. Department of Earth Sciences, The College of Wooster, Wooster, USA
4. Geological Collections of Natural History Museum, University of Tartu, Tartu, Estonia
5. Department of Geology, Tallinn University of Technology, Tallinn, Estonia