Abstract
Marine abrasion terraces cut in coralline limestone formations are to be noticed at various elevations in the coastal plain of the west coast of Saudi Arabia. In between Jeddah and Yanbu, three prominent terraces occur at altitudes of 1, 3 and 10 m above the present level. Coral limestone samples from the terraces were dated by the carbon-14 method. The radiometric ages reveal four marine transgressions in the west coast of Saudi Arabia (eastern Red Sea) from the mid-Pleistocene to Present. Sea-level maxima were recorded at about 31,000, 16,600-18,100, 9980 yrs B.P. and mid-Holocene(?).