1993. A GUIDE-LEVEL OF THE UPPERMOST HAUTERIVIAN (LOWER CRETACEOUS) IN THE PELAGIC SUCCESSION OF UMBRIA-MARCHE APENNINES (CENTRAL ITALY): THE FARAONI LEVEL. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA . 99, 4 (Dec. 1993). DOI:https://doi.org/10.13130/2039-4942/8897.