Thanks to the loan of the departmental museum of the Seine-et-Marne visit a travelling exhibition on the Meulière stone, which abounds in the basement of the Parisian basin. Extracted and used for centuries in the Paris region, it has become the emblematic material for construction. Among the extraction centres, the one in the region stood out for the special qualities of the extracted stone, ideal as a grain-milling material, or other products requiring this preparation (mustard seeds, kaolin...).