Lithostratigraphic interpretations are here presented of a carbonate body which rims the exposed basement on the SE hinge zone of the Niger delta, and which thickens to over 450 m on a nearby subsurface basement horst. This faulted margin, which is known as the Calabar Flank, was occupied by carboqate platforms similar to those in the Gabon and Angola Basins, during the pronounced South Atlantic Albian transgression. Stromatolitic, oncolitic/pisolitic, oolitic and fossiliferous coralline algal lithofacies are well displayed both in outcrop and in the subsuface of the carbonate body (the Mfamosing Limestone). These lithofacies suggest a facies progression from tidal flats, through restricted marine bays and lagoons to a possible reef front, with ooid bars and encrusting and ramose coralline algae. In the subsurface, the Mfamosing Limestone, which is gas‐bearing and oil‐impregnated, exhibits fair to good porosities in which calcarenitic bars and chalkiped lagoonal, calcarenitic and extensively dolomitized limestones are the potential reservoirs.
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Reijers et al. (1987) studied this question.