Giuliano Ruggieri, 1965. "A Contribution to the Stratigraphy of the Marine Lower Quaternary Sequence in Italy", International Studies on the Quaternary: Papers Prepared on the Occasion of the VII Congress of the International Association for Quaternary Research Boulder, Colorado, 1965, H. E. Wright, Jr., David G. Frey
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Progress in the knowledge of the Italian Quaternary sequence has been retarded by some preconceived ideas and by objective difficulties in the dating of series of terraces or even of isolated terraces.
Among the first ones is the correlation between the Calabrian and the Villafranchian. Such a correlation is generally admitted despite some evidence to the contrary, for instance, the finding of the remains of Villafranchian vertebrates in a Pliocene marine deposit in Tuscany, indicating that the beginning of the Villafranchian preceded that of the Calabrian.
The boundary between the Pliocene and the Pleistocene has been proposed by different researchers...