Schematic 3D evolution of the Pyrenean-Cantabrian junction highlighting the structural evolution during the subduction (Late Santonian – Paleocene) and collisional (Eocene – Miocene) phases. The uppermost 3D block diagrams show the evolution with the decoupled sedimentary basins while the lowermost show the crustal architecture only. Saison TF: Saison Transfer Fault; SMD; South Mauléon Detachment; NMD: North Mauléon Detachment.