“…During Antiquity, different raw materials have been selected for the manufacturing of querns and millstones, following particular criteria (Delgado-Raack et al, 2009;Hartoch et al, 2015): accessibility of the useful beds, workability, efficiency and durability (resistance) of the rock. In addition to the better-known volcanic rocks from the Eifel region used for the production of mills (Gluhak & Hofmeister, 2009, 2011, our study revealed the frequent occurrence of different types of sedimentary rocks: Ypresian sandstones and puddingstones from the north-western Paris Basin (Picavet et al, 2011), Lutetian limestones from the northern Paris Basin (Robert & Landréat, 2005), Thanetian quartzarenites from the Flemish Basin (Grès de Grandglise-Blaton: Reniere et al, 2016).…”