Figure 4

A) Malagrotta section exposing the sedimentary deposit of the Valle Giulia Formation (MIS 13), erosionally above those of the older Ponte Galeria 2 Formation (MIS 17). A massive, sand matrix supported gravel layer (a,c) is present at the base of the incision hosting the aggradational succession of the Valle Giulia Formation (MIS 13), which cut through the sand deposit of the Ponte Galeria 2 Formation (MIS 17). The gravel is laterally in contact with both the primary deposit of the TGPP (d), as well as with abundant, sub-primary volcanic deposit (a,b), providing further evidence that the pyroclastic-flow deposit was emplaced during an erosive phase. See text for further details.