Paläontologische Zeitschrift

, Volume 73, Issue 1–2, pp 77–98 | Cite as

Cenomanian to Coniacian ostracodes from the Nkalagu area (SE Nigeria): biostratigraphy and palaeoecology

  • Holger Gebhardt


Ostracode faunas from three sections in the Nkalagu area, including the type section of the Nkalagu Formation, were analysed qualitatively and quantitatively. Based on the results, an ostracode zonation is proposed as follows: aCythereis sp. 2 Interval Zone (late Turanian to Coniacian), aCythereis vitiliginosa reticulata Interval Zone (Turonian) and aCytherella spp. Abundance Zone (Cenomanian). This zonation may be only of local (basin wide) character but should allow a micropalaeontological correlation of strata in the Lower Benue Trough. By comparison with sedimentological and palaeontological parameters, aCytherella dominated shelf/depleted oxygen-assemblage can be distinguished from aCythereis/Ovocytheridea dominated upper bathyal/suboxic to oxic-assemblage. The stratigraphic and palaeoecologic characteristics of the ostracode assemblages will be specified and presented in this contribution. Some of the species (Leguminocythereis sp.,Cytherella cf.comanchensis) are assumed to be replaced and to reflect the turbiditic activity in the area, resulting in carbonate deposits of economic significance.


Cretaceous Nigeria Foraminifera Cenomanian Dorsal View 
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Ostracodenfaunen von drei Profilen aus der Region um Nkalagu, einschließlich des Typ-Profils der Nkalagu Formation, werden qualitativ und quantitativ untersucht. Auf der Basis der Ergebnisse wird folgende Ostracodenzonierung vorgeschlagen: eineCythereis sp. 2-Intervallzone (spätes Turon bis Coniac), eineCythereis vitiliginosa reticulata-Intervallzone (Turon) und eineCytherella spp.-Häufigkeits-zone (Cenoman). Diese Zonierung ist wahrscheinlich nur lokal (beckenweit) gültig, sollte aber die mikropaläontologische Korrelation der Schichten im unteren Benué Trog erlauben. Im Vergleich mit sedimentologischen und paläontologischen Parametern kann eineCytherella dominierte Schelf/Sauerstoffmangel-Fauna von einerCythereis/Ovocytheridea dominierten oberbathyalen/suboxischen bis oxischen Fauna unterschieden werden. Die stratigraphischen und paläoökologischen Eigenschaften der Ostracodenfaunen werden spezifiziert und in diesem Beitrag dargestellt. Einige der Arten (Leguminocythereis sp.,Cytherella cf.comanchensis) wurden wahrscheinlich umgelagert und reflektieren die turbiditischen Ereignisse im Untersuchungsgebiet, die ihren Höhepunkt in der Ablagerung wirtschaftlich bedeutender Kalksteinlagerstätten hatten.


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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1999

Authors and Affiliations

  • Holger Gebhardt
    • 1
  1. 1.Department of Geology and Mineral SciencesUniversity of IlorinIlorinNigeria

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