Location of the subduction zones and interpretation of the SPR during Africa-Eurasia convergence in the Western Alps-Maghrebides area. A: Early drawing by Rehault et al. (1984); SPR occurred along time, at about 35 Ma; B: According to Vignaroli et al. (2008), opposite polarities occurred contemporaneously along the plate boundary. C: After Molli (2008), the Late Cretaceous Alpine subduction occurred along the “Betic Ocean” between Iberia and Alkapeca, and the Eocene-Oligocene Apenninic subduction along the opposite border of Alkapeca. D: Schmid et al. (2017) retain this scenario and provide a quantification of the Oligocene-Neogene displacement of the intervening continental blocks.