Left: detailed topographic map of the Beauvoisin area (modified after Gaillard et al., 1985). Nineteen sub-sites have been reported, including two new sites, S and T, which were exposed due to weathering since their initial discovery (Gay et al., 2019). Right: 360 m thick composite log of the Oxfordian in the Beauvoisin area (Gay et al., 2019). The red arrows show the three studied sub-sites A1, E1 and R, that developed during Early, Middle and Late Oxfordian respectively.