Regional Unconformities and Depositional Cycles, Cretaceous of the Arabian Peninsula
P.M. Harris, S.H. Frost, G.A. Seiglie, N. Schneidermann, 1984. "Regional Unconformities and Depositional Cycles, Cretaceous of the Arabian Peninsula", Interregional Unconformities and Hydrocarbon Accumulation, John S. Schlee
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Three regional unconformities are recognized during stratigraphic studies of Cretaceous sedimentary rocks of the Arabian Peninsula. the Cretaceous sequence can be divided into early (Neocomian through early Aptian), middle (late Aptian through early Turonian), and late (Coniacian through Maestrichtian) units by three unconformities of major importance: (1) an unconformity that represents erosion or nondeposition of the middle Aptian section and marks a significant lithological change from shallow shelf limestones of the Shuaiba Formation to overlying shallow shelf elastics of the Nahr Umr Formation; (2) an unconformity that reflects erosion or nondeposition of Turonian strata and is a break between shallow shelf limestones of the Mishrif Formation and overlying deep-water beds of the Fiqa Formation; and (3) an unconformity that separates the Cretaceous and Tertiary formations capping shallow shelf limestones of the Simsima Formation. A regional unconformity at the Jurassic-cretaceous boundary has not been recognized.
The subaerial exposure and erosion represented by each of the three unconformities is of great economic importance due to the development of reservoir-quality secondary porosities in rudist reef-bearing limestones. When the ages of these unconformities and the intervening depositional cycles in the Arabian Peninsula are compared with published eustatic curves, several differences are evident.
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The result of a session at the 1981 AAPG Annual Meeting, this volume attempts to document global age and magnitude of sea-level shifts, and ultimately, the cause of the short-term shifts. Twelve individual papers were published on topics such as: comparative anatomy of cratonic unconformities; relation of unconformities, tectonics, and sea-level change; outcrop features and origin of basin margin unconformities; significant unconformities and the hiatuses represented by them; regional unconformities and depositional cycles; relative sea-level changes during the Middle and Late Cretaceous; Late Oligocene-Pliocene transgressive-regressive cycles of sedimentation; oxygen-isotope record of ice-volume history; oceanic ridge volumes and sea-level change; Jurassic unconformities, chronostratigraphy, and sea-level changes; Cenozoic regional arosion of the Abyssal sea floor; and depositional sequences and stratigraphic gaps on submerged United States Atlantic margin.