Abstract
Rocks of the Campanian/Maastrichtian transition form the main bulk of the Duwi Formation, exposed in the Nile Valley, Southern Egypt. In terms of biostratigraphy, the concerned transition has been subdivided into three planktic foraminiferal zones coeval with two ammonite and three bivalve zones. The proposed zones have been integrated and correlated with other zonal schemes. The Campanian/Maastrichtian boundary has been located at the contact between the Campanian
Bostrychoceras polyplocum and the Maastrichtian
Pachydiscus neubergicus Ammonite Zones, corresponding with the contact between the Campanian
Globotruncana aegyptiaca and the Maastrichtian
Rugoglobigerina hexacamerata planktic foraminiferal zones, as well as the contact between the Campanian
Cameleolopha tissoti–Plicatula pausicostata and the Maastrichtian
Abruptalopha abrupta bivalve zones.