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2. Tertiary lithostratigraphy of Niger Delta;Akpoyovbike;Am. Assoc. Petrol. Geol. Bull.,1978
3. High-resolution sequence biostratigraphy of a lowstand prograding deltaic wedge: Oso field (Late Miocene), Nigeria;Armentrout,1999
4. Présence de Miocène inférieur marin dans le “continental terminal”de la Basse Côte d́ Ivoire;Bacchiana;Rev. Micropaléont.,1982
5. Peridinioid dinoflagellate cysts from the Oligocene of the Niger Delta, Nigeria;Biffi;Micropaleontology,1983