GLOBAL JOURNAL OF EARTH AND ENVIRONMENTAL SCIENCE
Integrity Research Journals
ISSN: 2636-6002
Model: Open Access/Peer Reviewed
DOI: 10.31248/GJEES
Start Year: 2016
Email: gjees@integrityresjournals.org
Sedimentology and biostratigraphic studies of a section in Ameki Formation along Umuahia Junction, Bende/Ohafia Road in Abia State, South-Eastern Nigeria
https://doi.org/10.31248/GJEES2025.194 | Article Number: 7C40C0181 | Vol.10 (2) - April 2025
Received Date: 08 April 2025 | Accepted Date: 28 April 2025 | Published Date: 30 April 2025
Authors: Acra, E. J.* and Soronnadi-Ononiwu, G. C.
Keywords: deposition, Biostratigraphic, bioturbation, paleoenvironment, sedimentological.
This study investigates the sedimentological and biostratigraphic analyses of a stratigraphic section of the Ameki Formation outcropping at Umuri and Ameki, near Umuahia was carried out with 20 samples collected at regular intervals to determine the age and paleoenvironment of deposition. The samples were analysed using a prtrographic and stereo microscope, and the preparation of the samples involved maceration and mounting on microscopic slides. Grain size analysis was carried out using a set of sieves and was visualised in a graphical method from which some simple statistical parameters were derived. The lithology varies from sandstone to shale. The sandstone exhibits cross bedding and bioturbation (evidence of organic activity). Twenty-six foraminiferal species were recovered, with benthonics dominating. The presence of Heterohelix globulosa, an index fossil of upper Maastrichtian, suggests that the age of the formation is late Maastrichtian-mid Eocene, and the forms show that they were deposited along the Continental shelf.
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