_____________________________________________________________________________________________________ *Corresponding author: E-mail: frederick.onu@uniport.edu.ng; British Journal of Applied Science & Technology 6(1): 24-33, 2015, Article no.BJAST.2015.064 ISSN: 2231-0843 SCIENCEDOMAIN international www.sciencedomain.org Discrimination of Depositional Environment Using Statistical Parameters of Conglomeratic Outcrop Sections, Obubra Southeastern Nigeria F. K. Onu 1* , D. O. Ikoro 2 , U. C. Emeruem 2 and D. O. Inyang 3 1 Department of Geology, University of Port Harcourt, P.M.B. 5323 Choba, Nigeria. 2 Department of Geology, Federal University of Technology P.M.B. 1526 Owerri, Nigeria. 3 Department of Geology, University of Calabar, P.M.B. 1115 Calabar, Nigeria. Authors’ contributions This work was carried out in collaboration between all authors. Author DOI formulated and supervised the research. Author DOI supervised the field work. Authors FKO and UCE carried out the research and prepared the manuscript with contributions from other co-authors. Article Information DOI: 10.9734/BJAST/2015/13540 Editor(s): (1) Rui Xiao, School of Energy and Environment, Southeast University, China. (2) Ahmed Fawzy Yousef, Geology Department, Desert Research Center, Egypt. Reviewers: (1) Anonymous, Institute of Geology and Geophysics, China. (2) Anonymous, Modibbo Adama University of Technology, Nigeria. (3) Anonymous, Università del Salento, Italy. Complete Peer review History: http://www.sciencedomain.org/review-history.php?iid=764&id=5&aid=7212 Received 21 st August 2014 Accepted 11 th October 2014 Published 15 th December 2014 ABSTRACT Statistical analyses reveal information of the hydrodynamics and environments of deposition of sedimentary rocks. The sediments of the outcrop sections from Uwakande 1, Obubra southeastern Nigeria were studied for their textural variations. Grain size analysis, and pebble morphogenesis carried out shows that the sediments are coarse to very coarse in size, poorly sorted, and very positively skewed. This in conjunction with the various bivariate plots employed, aid in discriminating between beach and river depositional environments. Pebble morphometric analysis of the conglomerates showed that the mean values of the various morphometric parameters range as follows: flatness ratio (S/L = 0.397 to 0.514), elongation ratio (I/L = 0.657 to 0.784), maximum projection sphericity (ΨP = 0.605 to 0.899), Oblate-Prolate index (ŌP = -1.738 to 1.594), coefficient of flatness (39.70 to 51.37), and roundness (-0.367 to 0.722). This study is significant in providing evidence of fluvial conditions during the deposition of the Eze-Aku Formation in the Turonian, and reveals the type of transporting medium; the mode of sediment deposition; as well as the environment into which the sediments encountered in the study area were deposited. Original Research Article