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A full account of 67 ditch cutting samples collected from Well 5, OML 34 in the Niger Delta at depth intervals between 2441m to 3650m is presented. Lithologic description of the samples shows seven lithostratigraphic units composed of shale, siltstone and sandstone corresponding to the Paralic Agbada Formation. Foraminifera analysis was carried out on these samples, a total of 51 species were recovered; 37 benthonic and 14 planktonic. The planktonic index recovered from the well, Praeorbulina glomerosa, Praeorbulina sicana, Orbulina saturalis, and Catapsydrax dissimilis, revealed that the age of the penetrated well is Miocene. Three planktonic foraminifera zones corresponding to Blow, 1969 (N6 – N7, N8 – N9 and N9) and Berggren et al., 1995 (M4, M4 – M5, and M5) zones are proposed for the well. The planktonic zones are Catapsydrax dissimilis Partial-range zone, Praeorbulina glomerosa Interval zone, and Orbulina universa Taxon – range zone, respectively. Sediments of the well are considered to be of normal marine depositional environment based on shell type ratio and triangular plot of the foraminifera test type (arenaceous, porcelaneous and hyaline). The paleobathymetry of the well ranges from non-marine to middle neritic environment based on foraminifera distribution. Emmanuel C. Nwaejije. Department of Geology, Ahmadu Bello University, Zaria, Nigeria. emmanuelcelestine01.ec@gmail.com Enam O. Obiosio. Department of Geology, Ahmadu Bello University, Zaria, Nigeria. eoobiosio@abu.edu.ng Ibrahim Hamidu. Department of Geology, Ahmadu Bello University, Zaria, Nigeria. hibrahim@abu.edu.ng

Foraminifera biostratigraphy and paleoenvironment of Well 5, OML 34, Niger Delta, Nigeria