Abstract
A section of the Mamu Formation exposed at River Adewogun in Orhua, southwestern Nigeria, consists of dark grey, fissile, shale overlain by dark -brown, fine to medium- grained moderately sorted, thinly bedded sandstone of the Ajali Sandstone. The shale yielded a rich assemblage of spore and pollen of Late Maastrichtian age namely, Monocolpites marginatus, Longapertite marginatus, Constructipollenites ineffectus, Foveotrilete margaritae, Spinizonocolpites echinatus, and Ulmaideipites krempii. A back mangrove to nearshore palaeoenvironment of deposition is inferred. The sequence stratigraphy revealed a flooding surface with high organic productivity representing a short period of poor circulation associated with transgressive events.
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