Simplified paleogeographic model of the of the Western Alps south-eastern foreland basin with the Saint Antonin and Barrême basins at A-B) 31 Ma and about 25 Ma C-D) with respect to the rising internal Western Alps, opening of the Ligurian Sea and rotation of the Corsica-Sardinia block during the early to mid-Oligocene (modified after Lacombe and Jolivet, 2005; Dumont et al., 2012; Jourdan et al., 2013; and Malusà et al., 2015). White arrows indicated main sediment supply to the two basin remnants.