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International Journal of Botany
Year: 2010  |  Volume: 6  |  Issue: 4  |  Page No.: 351 - 370

Palynological Evidence of Pliocene-Pleistocene Climatic Variations from the Western Niger Delta, Nigeria

E.U. Durugbo, O.T. Ogundipe and O.K. Ulu    

Abstract: Rich and well preserved assemblages of pollen, spores, and organic walled dinoflagellate cysts in 96 and 89 samples of Wells A and B from the Western Niger Delta Nigeria are recorded. The dominance of savanna pollen over wet climate indicators (mangrove, freshwater swamp species, brackish water swamp species and Palmae) and the preponderance of the dinocysts Polysphaeridium zoharyi and Operculodinium centrocarpum, species adapted to very saline and warm waters respectively, with abundant fungal spores dominated by Exesisporites sp., gives credence to a predominantly dry climate and lowered sea level during the Pliocene-Pleistocene (ca. 5.0-1.3 Ma) in the Gulf of Guinea. The most pronounced glacial events were around the 2.0-2.7 Ma, as well as between the 2.7-3.4 Ma.

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