The alluvial plain of Conca River (northern Apennines) is characterized by a wide valley floor with convergent terraces which have undergone continuous changes due both to climatic changes and tectonic uplift. Presently, an alluvial plain reaches a width of 6-7 km at the end of the valley, five to ten km far from the coast line. Alluvial deposits become gradually thicker toward the sea and consists mostly of alluvial fan facies. Entrenched fluvial deposits crop out in the more distal part of Conca River alluvial plain. They were recently exposed, because of anthropic activity which has induced variations of the river profile, and consist of marsh and fluvial deposits overlying directly Pliocene marine clays (Argille Azzurre), and separated at the top from more recent alluvial deposits by a sharp erosional surface. On the basis of the very rich archeological and paleontological record (the last one particularly represented by vertebrate remains) and the results of 14C dating of wood samples (carried out by previous authors), the youngest terraced deposits were assigned to the Holocene and the oldest alluvial deposits to a pre-Würmian Pleistocene age.