New geologic data were collected in the southern sector of the Roveto Valley, which extends between Balsorano and Sora villages (Southern Latium, Central Italy). Many authors regard this zone as a key-area in the geological framework of the Central Apennines. The study, based on data correlation from photogeological analysis and field surveys (at 1:10,000 and 1:25,000 scale), was aimed towards the reconstruction of the Neogene-Quaternary evolution of this portion of the Apennine chain. Structural analysis indicates that the study area experienced a multi-stage tectonic activity, which involved the Latium-Abruzzi carbonate platform sequence and Plio-Quaternary continental deposits. Both remote sensing and geological mapping identified some tectonic features not previously described: - a NW-SE trending thrust at the base of the Colle Rotondo-Colle Terelle Ridge. The formation of this carbonate structure, that overrides the Western Marsica Ridge, is related to the deformation of the Marsica domain in Late Messinian time; - a NW-SE oriented splay thrust located near the Sora village and genetically connected to the Simbruini-Ernici Mts. main thrust; - left-lateral, strike-slip faults generated during a tectonic event which occurred after the thrusting and likely after the elevation and the sub-aerial exposure of the chain. The main NW-SE oriented faults related to this event were found: i) along the contact between Colle Rotondo-Colle Terelle Ridge and the Western Marsica Ridge (M.te Cornacchia); ii) along the north-eastern side of the Roveto Valley; - normal faults prevalently NW-SE oriented and clearly cutting and rejuvenating faults having strike-slip kinematics. Identification of such tectonic features enable us to reconstruct the complex structural setting of the area and to formulate a new assessment of the geological evolution of the southern sector of the Roveto Valley, from Late Miocene to Early Pleistocene.

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