Cenozoic

Cretaceous

Neoproterozoic

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Jessu Formation

Jessu Fm

Period:

Cretaceous

Age Interval:

Upper Cretaceous (Turonian)

Province:
Benue Trough North -Yola Arm

Type Locality and Naming

The type locality is the villages named after it. The lower sequence is the Dukul Fm followed by the Jessu Fm in the Middle Sequence and Sekuliye Fm at the top of the Sequence.

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; Ojo and Akande, 2004; Jauro et al., 2007; Obaje, 2009; Nwajide, 2013

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

Lithology and Thickness

Schematically shown as sandstone in Fig. 2 of Sarki Yandoka et al., 2014.The Dukul Fm, Jessu Fm and Sekuliye Fm, the Numanha Shale Fm, and the Lamja Fm are the Turonian – Santonian equivalents of the Gongila Fm and Pindiga Fm in the Gongola Arm. The Turonian – Santonian deposits in the Yola Arm are lithologically and paleo-environmentally similar to those in the Gongola Arm, except the Lamja Sandstone Fm.

Jessu Formation generally ranges from 200 to 400 meters in thickness.

Lithology Pattern:

Fine-grained sandstone

Relationships and Distribution

Lower contact

Lies conformably on the Dukui Fm

Upper contact

Lies conformably below the Sekuliye Fm

Regional extent

Yola Sub-basin

GeoJSON

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Fossils

Ammonite (Vascoceras, Gombeoceras), Foraminifera, dinoflagellates, Pollen and Spores.

Age

Schematically shown as upper Turonian in Fig. 2 of Sarki Yandoka et al., 2014.

Age Span:

Beginning stage:

Turonian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

91.65

Ending stage:

Turonian

Fraction up in the ending stage:

0.9

Ending date (Ma):

89.84

Depositional setting

Marine. Early Turonian Transgression for the Dukul Fm and Jessu Fm, but not clearly stated for Sekuliye Fm.

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.