At least 4 attributes make the Mediterranean world indeed different and largely determine the nature of its soils: specific climate, its mountains, dust from the desert, and the long term effects of man. Space limitation allows only a brief
textural contrast at the upper limit of the argillaceous horizon, with a dark red very calyey and very thick Bt horizon (on the oldest surface) to not very thick brown soils without a clear clay illuviation and with a lower content in clay (on the youngest