1997. PALEOMAGNETIC AND PALYNOLOGIC INVESTIGATIONS IN THE UPPER VALDARNO BASIN (CENTRAL ITALY): CALIBRATION OF AN EARLY VILLAFRANCHIAN FAUNA. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA . 103, 1 (Mar. 1997). DOI:https://doi.org/10.13130/2039-4942/5285.