A new geological mapping and the availability of several geognostic data supplied by the Italian Railway Authority, allowed us to recognise an unconformity in the lithostratigraphic assemblages of the Vasto area Calabrian succession. Sediments grade upward from clay to sand and conglomerates according to a marine regression from off-shore ramp to beach and fluvio-lacustrine environments. The regional reconstruction of the stratigraphic setting points out a gentle angular unconformity between clay and sands. This tilting has been related to a regional uplift and tilting due to compressive deformation in the incoming near Apennine belt.

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