GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.1 115 identification of uplifted marine terraces in the 200 m to 50 m elevation range (Fig. 2) allows outlining the perimeter of the Plain in the early stages of its formation. Well-preserved marine terrace deposits are exposed in several quarries located along the southern slope of Mt. Fellino (Fig. 1). The outcrops show a several tens of metres thick transgressive-regressive succession consisting of beach conglomerates, fossiliferous arenites and sands, passing upwards to alluvial fan and slope deposits that rest onto wide wave-cut terraces, and are buried beneath younger alluvial fan and slope deposits. The marine-continental succession is dissected by N-S and NW-SE trending extensional faults, and is lowered beneath the Holocene alluvial plain by a major E-W trending fault system (Fig. 3). Faults showing similar trends and young activity are identified by geomorphological evidence and subsurface stratigraphy information more to the north, where they control the perimeter of the Holocene Volturno River alluvial plain. Fig. 2 – View from the SE of the marine terrace at about 200 m a.s.l. (indicated by the white arrows) located at the eastern boundary of the Campania Plain, at the termination of the Mt. Fellino ridge (in the foreground, location in Fig. 1). Fig. 3 – Slope deposits offset by a roughly E-W trending fault, in the southern slope of the Mt. Fellino ridge. The slope deposits overlie shallow marine deposits (downfaulted below the ground surface) and are unconformably covered by alluvial fan deposits.