Cenozoic

Cretaceous

Neoproterozoic

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Ogugu Formation

Ogugu Fm

Period:

Cretaceous

Age Interval:

Coniacian - Santonian

Province:
Benue Trough South

Type Locality and Naming

The formation is exposed in the Ogugu area (Agagu et al., 1985). Some publications consider this to be a member of the Awgu Fm; or a formation within an Awgu Gr (as used in South Benue Trough)

Synonym: Ogugu Shale; Ogugu Member of Awgu Fm

References: Reyment, 1965; Adeleye, 1975; Dessauvagie, 1975; Kogbe,1976; 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

[Fig. 1. Stratigraphic successions in the Benue Trough and the Nigerian sector of the Chad Basin]

[Fig. 2. Sedimentary Basins of Nigeria (Obaje, 2009)]

[Fig. 3. Stratigraphic packaging in the Southern Benue Trough (based on Reynment, 1965; Murat, 1972; Whiteman, 1982)]

Lithology and Thickness

The formation is estimated to have about 20m of dark grey, shelly, calcareous nodules, occasional coaly plant remains, and a few bands of sandstone. In the Ogugu area, 800m of the formation is exposed in the subsurface.

Lithology Pattern:

Sandy claystone

Relationships and Distribution

Lower contact

Transitional from the underlying Agbani Fm (Agagu et al., 1985)

Upper contact

- Unconformable (late Santonian-early Campanian hiatus) beneath the Nkporo Fm.

Regional extent

GeoJSON

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Fossils

Plant remains, Foraminifera (Hedbergella sp., Whitenella sp., Neobulimina, Cassidella, Nonionella, Planulina, Colonensis africana, Orthokarstenia olavata, Bolivina afra, Neoulimina subregularis, Bulimina prolixa, Bulimina fang, Ammobaculites sp., Haplophragmoides sp.)

Age

Age Span:

Beginning stage:

Santonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

85.70

Ending stage:

Santonian

Fraction up in the ending stage:

0.4

Ending date (Ma):

84.88

Depositional setting

Prodelta

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.