Oshosun Fm
Period:
Paleogene
Age Interval:
Paleocene to Eocene
Province:
Dahomey Basin
Type Locality and Naming
The Oshosun Formation only occurs west of the Okitipupa Ridge (Whiteman, 1982) and the formation was erected by Jones (1954)
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
It is composed of green to greenish grey clays and glauconitic shales interbedded with lose sand. The basal parts are arenaceous. Thin limestones and marls are locally or sporadically present (Nwajide, 2013). Billman (1992) noted that the formation is about 250m offshore.
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Akinbo Fm (Gradational boundary)
Upper contact
Regional extent
Dahomey Basin
GeoJSON
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Fossils
Gastropods, Lamellibranchs, Foraminifera, Nannoplankton, Ostracods, fish remains
Age
Paleocene to Eocene
Age Span:
Beginning stage:
Ypresian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
56.00
Ending stage:
Ypresian
Fraction up in the ending stage:
1.0
Ending date (Ma):
48.07
Depositional setting
deep marine – bathyal environment (Adegoke, 1969; Billman, 1992)
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.