The Faunal Assemblage of the Nkporo Shale at Asaga – Ohafia in Southeastern Nigeria: Implications for Age and Depositional Environments
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The Nkporo Formation outcropping at Asaga – Ohafia consists of a laminated shale facies comprising of dark carbonaceous shales, fragments of oolitic ironstones, ironstone concretions, elliptical nodules and micritic limestones. The faunal assemblage consists of ammonites, bivalves, gastropods and an arthropod. The ammonite species include Libycoceras dandense Howarth (1965) and Baculites teicherti Reyment (1955), and the bivalves include Inoceramus bantu Reidel, Inoceramus sp., Libantu sp., Cardium sp. Reidel, Nucula sp. and Glycymeris sp. The gastropods include Volutoderma aff. Plicata Dall, V. plicata, Turitella nodosa Romer, Lunatia sp., Aporrhais sp., Turbonilla sp., Gyrodes sp. Stoliczka while the arthropod Costacopluma sp. also occurs. The fauna and lithofacies in the study area are suggestive of a shallow marine environment during Campanian to Maastrichtian.
Publication Info:
Author: Chukwuemeka Frank R. ODUMODU and Ayonma Wilfred MODE
Volume: 50
Issue: September
Published By: Journal of Mining and Geology, 2024-09-01