Cenozoic

Cretaceous

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Dukamaje Formation

Dukamaje Fm

Period:

Cretaceous

Age Interval:

middle Maastrichtian

Province:
Sokoto Basin (S. Iullemmeden Basin)

Type Locality and Naming

The Rima Gr is divided into three packages–Taloka, Dukamaje, and Wurno formations (Nwajide, 2013). The Dukamaje Fm is exposed on the hill southwest of Dukamaje (Whiteman, 1982).

Synonym: Dukamaje Fm (Clay-Shale Group (Raeburn and Tattam, 1930).

Reference section: Reyment,1965; Adeleye,1975; Kogbe,1976; Dessauvagie, 1975; Petters, 1978; Offodile, 1980; Whiteman, 1982; Benkhelil,1989; Okosun, 1992; Guiraud, 1993; Akandeet al., 1998; Zaborskiet al., 1998; Jauroet al., 2007 ; Obaje,2009; Nwajide, 2013

[Fig. 1. Stratigraphic successions in the Nigerian sector of the lullummeden Basin (Sokoto Basin)]

Lithology and Thickness

Dukamaje Fm consists of dark fossiliferous shale with white spheroidal nodules and some thin limestone bands (Ogilbee and Anderson, 1965). Kogbe (1970 and 1976) stated that the Dukamaje Fm contains 98ft of Limestone and locally gypsiferous. It is estimated to be about 88ft at the Balle Borehole - GSN 3053 (Whiteman, 1982) and about 12m thick on the hill southwest of Dukamaje (Nwajide, 2013). It

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Overlies the Taloka Fm

Upper contact

Underlies the Wurno Fm

Regional extent

Iullemmeden Basin

GeoJSON

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Fossils

Rima Gr contains Mussels, Mososaurian bones, fish teeth (Raeburn and Tattam, 1930), Foraminifera (Miliamina, Trochammina), Ophiomorpha, Skolithos, thalassinoides, worm fecal castings, Ammonites (Lybicoceras), Arenaceous foraminifera (Miliammina, Trochammina, Haplophragmoides, Textularia, Ammobaculites, Ammodiscus), Mososaurus fossil (Mososaurusnigeriensis), fossil fish (Lamnaappendiculata, Lamnalibyca, Schizorhizastroemeri, Sphanoduslybicus), Ammonite (Lybicocerasafikpoensis), bivalves, echinoids, corals, Pelecypods, gastropods, Ammonites (Lybicoceras), Foraminifera (Ammodiscus, Nonion, Nonionella, Gavelinella, Orbignyainflata)

Age

Maastrichtian (assumed here to span the middle third)

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.33

Beginning date (Ma):

70.15

Ending stage:

Maastrichtian

Fraction up in the ending stage:

0.67

Ending date (Ma):

68.06

Depositional setting

Taloka Fm showed the initial stages of deposition in fluvial and deltaic environments, followed by transition into shallow marine settings of the Dukamaje Fm and followed by the Wurno Fm which indicates a further deepening and stabilization of marine conditions, with the development of a carbonate platform.

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.