1. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
2. School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Parkville, VIC, Australia
3. Petrostrat Ltd., Tan-Y-Graig, Parc Caer Seion, Conwy, UK
4. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, USA
5. Institute of Geology, Leibniz University Hannover, Hannover, Germany
6. Institute of Geology and Palaeontology, University of Münster, Münster, Germany
7. US Geological Survey, Florence Bascom Geoscience Center, Reston, VA, USA