Structural map showing the main structures identified on seismic profiles. Red structures are post-Cretaceous and apparently sealed by the MES. The Pierrelatte fault (PF), which has a normal component, is mechanically consistent with the regional stress field during Pyrenean orogeny if it acts as an extrados structure along the Echavarelles anticline hinge. The F3 normal fault would have behaved as a normal fault during Oligocene extension (Combes and Carbon, 1997; Ballas et al., 2014) . Red structures (Mondragon frontal thrust F2 and F1) might be the only ones active during or after the Pliocene, see text for more details.