Structure of the North Pyrenean Frontal Thrust along N-S profile located in the central Pyrenees (see Fig. 1 for location). (a) N-S Seismic reflection profile (85SAV2, courtesy of Total SE) with the position of Lannemezan-1 & 2, Clarens-1, 2 & 102, Monlong-1 and Recurt-1. (b) Section of the interpreted seismic profile and calibrated with wells. This section shows the geometry of the North Pyrenean Frontal Thrust, and the structure of the relatively preserved Aquitaine Basin.