Did the Benue Trough connect the Gulf of Guinea with the Tethys Ocean in the Cenomanian? New evidence from the Palynostratigraphy of the Yola Sub-basin

Musa B Usman* (Corresponding Author), Alexander T Brasier, David W Jolley, Usman Abubakar, Shehu Mukkafa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The Yola Sub-basin represents the lower portion of the bifurcated Upper Benue Trough, whose origin has been linked to the opening of the Atlantic Ocean in the Mesozoic. The sub-basin fill consists predominantly of siliciclastic and carbonate deposits, the ages of which have remained controversial until now. This work employs field observations integrated with palynostratigraphy to refine the stratigraphy of these Upper Cretaceous deposits. We delineate five palynozones, spanning the upper Albian eCenomanian, middle Cenomanian, upper Cenomanian, Turonian and ConiacianeSantonian. This palynology indicates that rocks previously thought to be Turonian are in fact Cenomanian. Further, the species Florentinia berran, Florentinia khaldunii, and Subtilisphaera senegalensis are all low latitude dinocysts that previously have only been reported from the Tethyan realm. Their presence here, together with the sedimentology, implies that there was an influx of Tethyan waters into the epeiric sea of the Benue Trough in the Cenomanian. The collective sedimentary and palynological evidence indicates that the Cenomanian transgression was well established in the Yola Sub-basin, and more broadly in the Upper Benue Trough, connecting Tethys with the Gulf of Guinea.
Original languageEnglish
Article number104683
Number of pages16
JournalCretaceous Research
Volume119
Early online date24 Oct 2020
DOIs
Publication statusE-pub ahead of print - 24 Oct 2020

Keywords

  • Trans-Sahara
  • Late Cretaceous
  • Palynomorphs
  • biostratigraphy
  • Benue Trough
  • Nigeria
  • Failed rift
  • Biostratigraphy

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