water Article Submarine Geomorphology of the Southwestern Sardinian Continental Shelf (Mediterranean Sea): Insights into the Last Glacial Maximum Sea-Level Changes and Related Environments Giacomo Deiana 1,3, Luciano Lecca 1, Rita Teresa Melis 1 , Mauro Soldati 2 , Valentino Demurtas 1,* and Paolo Emanuele Orrù 1,3 1 Department of Chemical and Geological Sciences, University of Cagliari, 09042 Monserrato, Italy;
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[email protected] Abstract: During the lowstand sea-level phase of the Last Glacial Maximum (LGM), a large part of the current Mediterranean continental shelf emerged. Erosional and depositional processes shaped the coastal strips, while inland areas were affected by aeolian and fluvial processes. Evidence of both the lowstand phase and the subsequent phases of eustatic sea level rise can be observed on the continental shelf of Sardinia (Italy), including submerged palaeo-shorelines and landforms, and indicators of relict coastal palaeo-environments. This paper shows the results of a high-resolution survey on the continental shelf off San Pietro Island (southwestern Sardinia). Multisensor and Citation: Deiana, G.; Lecca, L.; Melis, multiscale data—obtained by means of seismic sparker, sub-bottom profiler chirp, multibeam, side R.T.; Soldati, M.; Demurtas, V.; Orrù, scan sonar, diving, and uncrewed aerial vehicles—made it possible to reconstruct the morphological P.E.