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Three surface and subsurface sections of Lower Cretaceous strata from the Gulf Coast are correlated with three comparable sections in Oman. Detailed fossil ranges and graphic correlation methods resulted in a biostratigraphic data base that could be related to the geologic time scale.

Two events of relative sea-level rise are synchronous in the Gulf Coast basin and the southeastern Arabian platform and may represent eustatic sea-level rises. The intra-Aptian rise began about 115.8 Ma and in many places is represented by a sharp lithologic change, by submarine hardgrounds, or by onlap. Deep-water deposition resumed from 115.2 to 113.9 Ma. The intraCenomanian rise began approximately 94.6 Ma. In Oman, this rise is locally represented by a submarine hardground that formed after drowning of a carbonate shelf. In the updip Gulf Coast, mid-Cenomanian paralic and deltaic sediments were deposited upon an Albian-early Cenomanian shallow carbonate shelf. In the downdip Gulf Coast, this event either is not recognizable in deep-water muds or is represented by drowning of shallow-water carbonates. A third, intra-Albian event at 104.3 Ma may also be a eustatic sea-level rise; however, it needs to be identified in other tectonic settings.

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