Biostratigraphy and Paleoecology of a Section of Shagamu Quarry (Southwestern Nigeria)


Ojekunle V.O1*, Talabi O.H3, Ojekunle Z.O2, Shanxiong Chen1 and Adewole A.A4


Research Paper I Published July,2015


Journal of Scientific Research and Essays Vol. 1 (1), pp. 1-10


1State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China. 2Federal University of Agriculture Abeokuta Ogun State, Nigeria.

3Olabisi Onabanjo University Ago-iwoye, Ogun State, Nigeria.

4Institute of processing Engineering, CAS, Beijing China.

*Corresponding author E-mail: rojeks@yahoo.com.     

Twenty one representative samples collected from the quarry of West African Portland Cement Factory in Ogun State, 60km from Lagos state were treated for microfauna as well as studying the Lithological contents in other to establish the Biostratigraphy, Paleoecology and Lithology of the exposed strata. The treated microfauna content yielded Planktonic and Benthonic foraminifera along with Ostracods. These are studied to interpret the Biostratigraphy and Paleoecology of the study area. The Planktonic foraminifera species includes; Globorotalia aequa, Globorotalia acuta, Globorotalia pseudobulloides, Globigerina triculinoides. Benthonic foraminifera species includes; Bulimina asperoaculeata, Ammonia becarrii, Nonion costiferum, Bulimina paleocenica. The microfauna assemblages show diagnostic Paleocene to early Eocene age. This is established by the presence of Globigerina triculinoides and Globorotalia pseudobulloides as indicative of Paleocene to early Eocene trends. Paleontological deductions and reconstruction were made on the basis of foraminifera and ostracod assemblage. The combinations of Planktonic and Benthonic as well as the lithological characteristics of the study area reveals that the environment of deposition may be inner neritic with middle neritic influence due to partial exposure to the sea and these could be correlated with other areas in the world.

Key words: Stratigraphy, Micropaleoentogy, Biostratigraphy, Paleoenvironment.


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