Integrated calcareous planktonic biostratigraphy on the upper Cretaceous-lower Paleogene successions, Eastern Desert, Egypt. This work depends on litho- and biostratigraphic analysis carried out on stratigraphic interval spanning the upper Cretaceous-lower Paleogene successions at Eastern Desert, Egypt. Three sections are collected and subjected to litho-, and biostratigraphical analysis. These sections are Gabal Serai at the Nile Valley near Qena City, Gabal Duwi and Gabal Um El-Huetat at the Red Sea Coast near Qusier and Safaga cities respectively.