At St. Severa town, in the area in the basement, there is an area of about 2 hectares, which highlight the Roman walls.  These walls, all parallel to each other, emerge from the soil at the coast and found a length of 200 m, which suggests that it is at least two separate buildings.  Probably when Rutilio Namaziano (De Reditu 415 A.D.), sailing along the coast, speaks of the beautiful villas of Pyrgi also referred to these villas.  The area known archaeologically but has never been subject to a systematic excavation, including 800 during the many excavations directed by the Duchess Sermoneta that the area was used only for grazing, probably because the property of the order of the Holy Spirit. The walls are cement blocks of sedimentary rock (marl clay and compact), typical of our coastline.  The average size of the walls are 70 cm thick and 1m high, this combined with the absence of an external parameter (opus reticulatum etc..) Tells us that we are looking at the walls used as a foundation for edifici.Dal material dispersed on the surface , can be traced back to the era of these villas to the first century.  DC and the absence of peaches makes us understand that the villas were otium (residential villas).  Traces of burning in the build we suggest that the houses were burned and most likely this happens with the passage of Alaric's Visigoths during the sack of Rome (410 A.D.).  Interesting is the coming to light after the heavy storms of 2006-2007 and a fossil deposit of funds of a prehistoric hut.  The prehistoric hut is located on a basement sedimentary conglomerate of about 10 square meters, on this emerging platform of circular holes, arranged regularly, about 10cm in diameter and 20-40cm depth (the holes are still invaded by marine sediment). Since the Holocene sand layer above it, we can assume that these holes for the piers of the Neolithic.  Interesting is a sedimentary rock oval about 30 cm in diameter, which likely has a cave painting of a deer, and spectral analysis by ImageJ has confirmed that the black color is a second surface coated on the first and not an effect of oxidation, unfortunately next survey in 2008 found that on the rock has been removed (perhaps by the storm or maybe the usual raiders!).  The fossil deposit is divided into two sharp layers: the first is of limestone and has only cemented specimens of Ostrea edulis (oyster), the second-gritty limestone (conglomerate) has for Pectinidae (perhaps Acanthocardia tuberculata), they lived bivalve in a tropical climate at different depths, the oyster edulis lives in average depth of about 50m, while the scallops in question lives in coastal environments of muddy-type lake.  This difference in depth explains why so much of a marked separation of the two types of bivalve molluscs in two layers that are formed naturally in different phases, but during the same period, according to the geology of Italy, which corresponds to a period ranging between the middle and last Pliocene.  Furthermore, the fact that the two clusters of shellfish are "shuffled" indicates that deposits are two alien transported along the coast from erosion and therefore the original layer was formed during the middle Pliocene (2.6 million years ago) with the lifting of the coast Lazio.


                
                
                






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