Evolutionary outline of the structure in the Luarca area. (a) Attitude of the cleavage S₁ after the first deformation phase; (b) development of major folds during the third deformation phase with subhorizontal limbs and steeper limbs; (c) tightening of the third phase folds with development of minor folds and S₃ cleavage in the subhorizontal limbs; (d) development of kink bands on strongly inclined limbs. After Bastida et al. (2010).