Sketch illustrating the mechanisms of NCO emplacement from the Lower Eocene to the Oligo-Miocene. Stages 1 and 2: a thrust fault (prolongation of the NPFT) was developed during the Pyrenean orogeny along the Cévenole Fault System, thanks to a previously emplaced salt diapir. The thrust-fault has been then uplifted and flattened during two consecutive geodynamic episodes: an Oligocene uplift (stage 3) predating the Gulf of Lions rifting and the subsequent Miocene rifting (stage 4), creating a rift shoulder, west of the Narbonne basin.