THE LATEST CONTINENTAL FILLING OF VALLE UMBRA (TIBER BASIN, CENTRAL ITALY) DATED TO ONE MILLION YEARS AGO BY MAGNETOSTRATIGRAPHY (R. Bizzarri, A. Albianelli, P. Argenti, A. Baldanza, R. Colacicchi, & G. Napoleone , Trans.). (2010). Alpine and Mediterranean Quaternary, 24(1), 51-65. https://amq.aiqua.it/index.php/amq/article/view/240