Cenozoic

Cretaceous

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Ise Formation

Ise Fm

Period:

Cretaceous

Age Interval:

Early Cretaceous

Province:
Dahomey Basin

Type Locality and Naming

The Abeokuta Gr consists of upward succession of three formations – Ise Fm, Afowo Fm and Araromi Fm. The Ise Fm interval thickness is estimated to be 4,100 – 5,962m (1,862m) and the unit was identified based on drill holes in well Ise-2 and also noted in wells Afowo-1 and Ojo-1 (Omatsola and Adegoke 1981; Nwajide, 2013).

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

Ise Fm: It is a pre-drift succession of conglomerates, sands, and mudrocks overlying the Basement Complex and continues upwards with medium to coarse, loose sand interbedded with kaolinitic clays (Nwajide, 2013). It is about 1,862m thick in the Ise-2 well (Omatsola and Adegoke, 1981).

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

It rests on the Basement Complex

Upper contact

Afowo Fm

Regional extent

Dahomey Basin

GeoJSON

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Fossils

Sporomorphs (Cicatricosisporites sp., Pilosisporites trichopapillosus, Klukisporites pseudoreticulatus), Pollens (Multiporopollenites aff., M. muculosus), Ammonites (Pachydiscus, Sphenodiscus), Foraminifera,

Age

Berriasian – Hauterivian (Nwajide, 2013, after Hessouhet al., 1994); but schematic chart suggest the upper clay-rich interval spans Aptian-Albian.

Age Span:

Beginning stage:

Berriasian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

143.10

Ending stage:

Albian

Fraction up in the ending stage:

1.0

Ending date (Ma):

100.50

Depositional setting

Alluvial fan setting at the basin edge of the sequence followed by a marine depositional environment within the Araromi sequence.

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.