A. Simplified Pyrenean structural sketch of the study area, superimposed onto the top-of-basement map (shades of grey). The overall structure corresponds to a left-lateral wrenching accommodating oblique convergence; the thrusts appear as restraining bends or splays of major, NE-striking basement strike-slip faults. B. Simplified rifting structural sketch of the study area. The synrift isopach map (shades of pink overlay) highlights the major extensional fault. The NW-trending transfer zones did not appear in the previous stage: they are thus newly formed during rifting. Note that synrift structures in the SW corner of the area are poorly documented in the present study.