Analysis of the exposed marine and marginal marine strata in northwestern Nigeria and the neighboring Niger Republic (southeastern lullemmeden basin) permits Stratigraphic correlations throughout the intracontinental epeirogenic basin. This has shed considerable light on the paleogeography of the south-central Saharan region during Maestrichtian-Paleocene time. On the basis of the hypersaline lithologies and restricted faunas in the Maestrichtian-Paleocene cyclic marine deposits of the southeastern lullemmeden basin, the terminus of the Saharan seaway was in northwestern Nigeria.

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