. The remote sensing information was generated from Landsat TM and Landsat ETM+ images for the period 1984-2006, which were merged with aerial photographs. The study was performed in a corridor of Eocene marls in the Pre-Pyrenees. Various spectral indices were
assessed for their performance in revealing badland dynamics. From the results, the normalized difference vegetation index (NDVI) is recommended. A map of possible erosion risk was generated as a function of the initial environmental conditions