1. Renard Centre of Marine Geology Ghent University Krijgslaan 281 (S8 WE13) Ghent Belgium
2. Institute of Geology University of Innsbruck Innrain 52 Innsbruck Austria
3. Royal Belgian Institute of Natural Sciences OD Earth and History of Life Geological Survey of Belgium Jennerstraat 13 1000 Brussels Belgium
4. U.S. Geological Survey 4210 University Drive Anchorage AK USA