Hydrodynamics and Depositional Implications of Rhythmic Thickness Variations in the Nanka Formation at Umunnya, South Eastern Nigeria

ABSTRACT The rhythmic thickness variations in the Nanka Formation exposed in a roadcut at Umunnya were measured and analyzed to confirm (i) that the rocks were deposited under strong tidal influence, and (ii) to determine the specific tidal system that prevailed at the time of sedimentation. Facies analysis reveals three lithologic intervals: sandy, claystone and...
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