BIOSTRATIGRAPHY OF THE UPPER CRETACEOUS SEQUENCE OF THE GEBEL-MUSABAA-SALAMA AREA, SOUTHWEST SINAI, EGYPT

The Upper Cretaceous Sequence exposed in the Southwest of Sinai at Geb el Musabaa Salama is divisible into four rock units. They are, from ba se to top, the Raha, Abu Qada, Wata, and Matulla Formations, Based on macrofossil occurrences, four molluscan biozones have been established which facilitate the inter-regional correlation of the sequence studi ed. They are: the Ilymatogyra africana-Exogra olisiponensis range zone of late Cenomanian age, the Early Turonian Vascoceras proprium interv al zone and Choffaticeras range zone, and the Santonian Pycnodonte pro boscideum range zone. Several minor breaks in sedimentation of the stu died sequence, probably diastems, have been recognized. The Lower Turo nian succession is bounded by two unconformity surfaces separating it from the overlying Santonian and underlying Cenomanian successions. It is concluded that Upper Turonian and Coniacian Sequences are missing.