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The Montagna della Majella is an arc-shaped anticline trending NW-SE in the north and NNE-SSW in the south, made up of Mesozoic-Tertiary carbonates overlain by Messinian evaporites and marls followed by lower Pliocene siliciclastic flysch deposits (Fig. 1). In the north, the Majella Unit is tectonically covered with a by closely folded Messinian-lower Pliocene siliciclastic flysch deposits belonging to the Queglia Unit, a nappe occupying in the Apenninic edifice an intermediate position between the Majella and the Morrone-Porrara units. The northern termination of Majella beneath the Queglia Unit follows the periclinal closure of the structure controlled by the gentle plunging of the fold axis towards the NW. The southern termination, controlled by an axial plunging towards SSW, is less regular because of the occurrence of extensional faults which have re-utilized the previous thrust surface of the Morrone-Porrara Unit over Majella (see Fig. 2). Along the eastern flank of the anticline, which dips regularly towards the east (Fig. 3), basin-derived allochthonous sheets (Molise Nappes) tectonically lie over the Pliocene flysch of Majella.