The Apennines are a retreating collisional belt where the foreland basin system, across large domains, is floored by subaerial forebulge unconformity developed due to uplift and erosion. This overlain diachronous sequence of three lithostratigraphic units made (a) shallow-water carbonates, (b) hemipelagic marls shales (c) siliciclastic turbidites. Typically, latter two have been interpreted reg...