Wukari Fm
Period:
Cretaceous
Age Interval:
Cenomanian-Turonian
Province:
Benue Trough Central
Type Locality and Naming
Not yet given.
References: Reyment, 1965; Adeleye, 1975; Kogbe, 1976; Dessauvagie, 1975; Petters, 1978; Offodile, 1980; Whiteman, 1982; Benkhelil, 1989; Okosun, 1992; Guiraud, 1993; Akande et al., 1998; Zaborski et al., 1998; Jauro et al., 2007; Obaje, 2009; Nwajide, 2013
Lithology and Thickness
Wukari Fm is made up of marine shales, sandstones and limestones. The shales are barren of fossils (Petters, 1983).
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Overlies the Makurdi Fm
Upper contact
Unconformably overlain by the Awgu Fm,
Regional extent
Benue Trough Central
GeoJSON
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Fossils
Ammonites (Euomphaloceras septemseriatum, Hoplitoides ingens), Foraminifera, bivalves (Costagyraolis iponensis), Gastropods
Age
Middle Cretaceous. The four formations indicated in the Cenomanian through mid-Turonian interval are given quasi-equal durations here (Keana Fm = Early Cenomanian, Zurak Fm = Middle Cenomanian, Makurdi Fm = Late Cenomanian, and the Wukari Fm = lower Turonian)
Age Span:
Beginning stage:
Turonian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
93.90
Ending stage:
Turonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
91.65
Depositional setting
Marine depositional environment, specifically a shallow to moderately deep marine setting. The Wukari Fm is said to be of an early marine transgression indicating a brackish marsh along marginal parts of the sea (Nwajide, 2013).
Depositional pattern:
Additional Information
Compiler:
Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024)- Stratigraphic Lexicon compiled from the following books:Nigeria: Its Petroleum Geology, Resources and Potential, by Arthur Whiteman, 1982; (Volume 1) Published by Graham and Trotman Ltd.A review of the Cretaceous System in Nigeria by P. M. Zaborski (1998) In Africa Geoscience Review, Vol.5, No.4, pp385-483
Geology and Mineral Resources of Nigeria by Nuhu George Obaje, Published by Springer-Verlag Berlin Heidelberg 2009; http://www.springer.com/series/772
Geology of Nigeria Sedimentary Basins, Nwajide C. S., 2013; Published by CSS Bookshops Limited, Lagos Nigeria.