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Late Cretaceous to Tertiary subsidence and global eustasy are recorded in the sedimentary basins along the Gulf of Guinea in the eastern Equatorial Atlantic margin. The major marine transgressions occurred in the middle to late Albian, late Cenomanian to early Turonian, late Turonian to early Santonian, late Campanian to Maestrichtian, middle to late Paleocene, middle to late Eocene, late Oligocene, and early to middle Miocene. Foraminiferal and ostracod ages from the Benue Trough, the Niger Delta, and the Dahomey Embayment in Nigeria and Benin Republic allow a time framework whereby comparisons of the timing of marine events and faunal developments can be made across the Atlantic Ocean. Although the eastern margin of South America has been the traditional area in which similarities a e sought with West Africa, comparisons with the eastern margin of North America are becoming feasible as more information accumulates from the latter region.

Foraminiferal paleo-ecologic data from the Nigerian basins allow the recognition of intervals of paleo-anoxicity, and the delineation of trends of ancient submarine canyons.

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