Petters, S. W. (1983). Gulf of Guinea planktonic foraminiferal biochronology and geological history of the South Atlantic. The Journal of Foraminiferal Research. 13(1): 32-59.

188248

10.2113/gsjfr.13.1.32 [view]

Petters, S. W.

1983

13(1): 32-59

Publication

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Planktonic foraminifera in three Gulf of Guinea coastal basins (Benue Trough, Dahomey Embayment, and Niger Delta) are used to date the transgressive onlap wedges in the region. Major transgressive peaks occurred during the Cenomanian-early Turonian, late Turonian-Coniacian, middle-late Maastrichtian, early Paleocene, late Paleocene, latest Paleocene-early Eocene, middle Eocene, latest Eocene, middle Oligo­ cene-early Miocene, late early-early middle Miocene, and late Miocene-Pliocene. In the Upper Cretaceous the dominance of heterohelicids and hedbergellids in the early marine phases allows biostratigraphic reso­ lution at the stage level, while the prevalence of normal marine environments during the Tertiary enables the recognition of low-latitude planktonic foraminiferal zones. In general, the Cretaceous-Tertiary environ­ ments in the Gulf of Guinea favored diversification among the Heterohelicidae; three new species in this group are described, namely, Heterohelix fayose, Chil­oguembelina subwilcoxensis, and Streptochilus dubeyi. The Gulf of Guinea planktonic foraminiferal ages improve our understanding of the paleoenvironmellts and depositional processes in the South Atlantic Ocean and add precision to the interpretation of the timing of marine transgressions in West African coastal basins.

Foraminifera

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