Contribution
Mid-Late Tertiary foraminiferal events and stratigraphic hiatuses in Egypt
Ouda, Khaled
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 209 Heft 2 (1998), p. 145 - 215
185 références bibliographiques
publié: Aug 18, 1998
DOI: 10.1127/njgpa/209/1998/145
ArtNo. ESP155020902000, Prix: 29.00 €
Abstract
A sequence of larger and/or planktonic foraminiferal events and hiatuses ranging in age from the beginning of the Oligocene to the end of the Pliocene could be recognized and objectively identified within many subsurface and surface sections in different parts of Egypt, including the northern Western Desert, the Nile Delta, the northern Eastern Desert, the northern Sinai, the Gulf of Suez region and the northern sector of the Egyptian Red Sea. The bioevents are calibrated to the recently revised Cenozoic time scale and the sequence is assigned to the global Oligocene-Pliocene chronostratigraphic units. The planktonic foraminiferal events provide the utilization of the subtropical biozonation during the Oligocene and Early Miocene, the transitional biozonation during the Middle-Late Miocene, and the regional Mediterranean biozonation during the Pliocene. Additional subdivisions are introduced during the Burdigalian-Messinian interval in order to clarify the peculiar conditions of the Mediterranean since the development of the first land bridge between Africa and Eurasia. The stratigraphic hiatuses are evaluated in different parts of Egypt in terms of Ma, and correlated with equivalent paleogeographic events in the Mediterranean and with some oceanic hiatuses. A chronostratigraphic correlation between the Oligocene-Miocene rock units in different areas of Egypt has been established, and two equivalent rock units are proposed to reflect the late Tortonian transgression of the Mediterranean along the northern shore of Egypt and of the Indian Ocean in the Red Sea area.
Mots-clefs
planktonic • foraminiferal • subsurface • biozonation • transgression • land bridge • Oligocene • Pliocene • Nile Delta • Sinai • Egypt