Département de la Somme (1) Deterioration (1) Parts (1) Altitudes (1) Dating (1) Parts (1) Tablecloths (1) Stone age (1) River sediments (1) Paleopedology (1) Nature (1) Prehistoric peoples (1) Licenses (1) Intertropical convergence zone (1) Glacial epoch (1) Flint (1) Flight (1) Character (1) Chalk (1) Carbonates (1) Alluvium (1) Soils (1) Erosion (1) Vuelo (1) Autorizaciones (1) Sedimentos fluviales (1) Edad glaciar (1) Erosión (1) Carácter (1) Edad de piedra (1)