1. Operational Directorate Natural Environment, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, 1000 Brussels, Belgium
2. Renard Centre of Marine Geology, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium
3. Database, Document and Content Management, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium
4. TNO – Geological Survey of the Netherlands, Princetonlaan 6, 3584 CB Utrecht, the Netherlands