Resumen de Superficies de erosión y tectónica neógena en el extremo occidental del Sistema Central español.
Paleogene erosion surface (SI), with plioquaternary retoruching (SrD), is unleveled and tilted in diferent blocks. Main movements occured in Iberica stage or Castallana phase *Upper Oligocene - Lower Miocene) and Guadarrama stage or Neocastellana and Iower Tortanian phases (Iower to middle Miocene). Neocastellana phase probably was the most important of them and reactivated as thrusts former normal faults, striking NE-SO to ENE-OSO)
