GNGTS 2016 - Atti del 35° Convegno Nazionale

532 GNGTS 2016 S essione 3.2 during the Late Pleistocene (isotopic stages 5e and 5c) have evidenced an overall tectonic stability of this tract of the shore from the Tyrrhenian stage to present-day times (Romano, 1992). The lack of relevant vertical movements during the last thousand of years has been evidenced by the height of the Versilian beach deposits. These deposits have been observed in the fluvial and coastal depressions, incised during the previous glacial regression, for more than 2 km in the inner of the shoreline (Cinque et al. , 1994). The present-day coastal cliffs are incised in the arenaceous and silty successions of the Pollica Formation. The geological survey of the Quaternary deposits between the towns of Agropoli and Ogliastro Marina has evidenced the occurrence of five sea level palaeo-stands at altitudes ranging between 25 m and 1.5 m above the sea level. The oldest levels, the Comenale Complex and the S. Antonio – S. Marco sandstones Complex have been tentatively ascribed to the stages 9 and 7 of the isotopic stratigraphy. Next palaeo-stands (+8, +10, +4 m above the sea level) are represented by abrasion terraces and notches, ascribed to the stages 5e and 5c of the isotopic stratigraphy. The stratigraphic units individuated in the adjacent offshore through the seismo-stratigraphic analysis belong to the Late Quaternary depositional sequence. In this sequence, the space and time evolution and the lateral and vertical migration of the marine coastal, continental shelf and slope depositional environments pertaining to the Late Pleistocene to Holocene glacio- eustatic cycle have been recognized. The stratigraphic succession records the variations of the accommodation space of the Late Quaternary deposits during the last 4 th order glacio-eustatic cycle, ranging between 128 ky B.P. (Tyrrhenian stage) and present-day times (isotopic stage 5e). Several local unconformities overlie coarse-grained deposits, filling intra-basinal depressions or palaeo-channels located at the top of the acoustic basement. Fig. 1 – High resolution seismic profiles (Subbottom Chirp) B61a, B61b and B62 recorded in the Licosa morpho- structural high and in the surrounding offshore and corresponding geological interpretation. Note the occurrence of several seismic units and wide outcrops of rocky acoustic basement, downthrown by normal faults in correspondence to the Licosa morpho-structural high.