This paper deals with the chronostratigraphical interpretation of fluviokarstic terraces of the Cerro de la Oliva (Patones,Madrid). A magnetical reversion near Causs-Matuyama boundary in the uppermost deposits level and a rich fossil mammals assemblage of Lower-Middle Pleistocene boundary found In the lowermost level fluviokarstic terraces, allowed to determine that fluvial incission started, in this area, during Upper Pliocene times
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