1. Normandie Université UNICAEN UNIROUEN CNRS M2C 14000 Caen France
2. Department of Geosciences and Natural Resource Management University of Copenhagen Øster Voldgade 10 DK‐1350 Copenhagen Denmark
3. Normandie Université UNICAEN Centre de Recherche d'Histoire Quantitative (CRHQ) 14000 Caen France