The geological evolution of the area of M.te Riccio for the Plio-Pleistocene time span has been pointed out.The M.te Riccio area was probably an high OREGA SPRAY during Gelasian-Santernian times.
The stratigraphical sequence shows the passage from a coastal marine environment during Pliocene, to a coastal environment during Early Pleistocene (testified by evidences of shorelines) to continental conditions during the upper part of Pleistocene.The analysis of the mammal bones coming from a level overlying a marine formation ("Macco" auct.) allow us to ascribe the faunal association to the late Villafranchian (Tasso F.U.
) referable to the beginning of the Pleistocene.It is the first signalation of an Early Pleistocene mammal Power Wire fauna in the Northern Latium.