NIGERIAN JOURNAL OF SCIENCE AND ENVIRONMENT
Journal of the Faculties of Science and Agriculture, Delta State University, Abraka, Nigeria

ISSN: 1119-9008
DOI: 10.5987/UJ-NJSE
Email: njse@universityjournals.org


PALAEOPALYNOLOGY AND SEQUENCE STRATIGRAPHY OF THE MAMU FORMATION AROUND ORHUA, SOUTHWESTERN NIGERIA

DOI: 10.5987/UJ-NJSE.17.106.1   |   Article Number: 64EBD420   |   Vol.12 (1) - May 2013

Author:  Odedede O.

Keywords: Palynology, Sequence stratigraphy, organic, nearshore, transgressive

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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