Neogene folds in Ronda Depression (Western Betic Cordillera).

The Ronda Depression is filled by Neogene sediments on the boundary between Subbetic reliefs, with NE-SW structural trends, and the frontal Subbetic Chaotic Complexes. The folding style in the Subbetic Units of Western Betics is strongly controlled by the rheology of the rocks: thick and massive beds of Jurassic limestones over Triassic marls and gypsum with plastic behaviour. Main deformation structures in the sedimentary infill of the Ronda depression are simultaneous box folds with NNE-SSW and WNW-ESE trends that only affect its southwestern part. This distribution of folds is a consequence of the inherited fold trend that affected the basement during Early Burdigalian age. [ABSTRACT FROM AUTHOR]