Abstract
Facies patterns within the Late Pleistocene raised coral reefs at Rabigh area, Red Sea coast, Saudi Arabia exhibit lateral and vertical changes. It starts in the east with a fossil shore and ends in the west with sediments of reef slope at the present shoreline. Vertical pattern shows a transgressive sequence. In the present work 35 gastropod and 16 pelecypod species belonging to 30 families and 37 genera have been identified. Biogeographic distribution of the studied species indicated that most of the recorded species are belonged to Indo-Pacific affinity with a very few Atlantic-Mediterranean. Their geologic range extent to Oligocene age.