Dukul Fm

The type locality of the Dukul Fm is in the village of Dukul with good exposures also at Bambam and Lakun on the Gombe – Yola road. 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]

Schematically shown as liimestone 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.

Thickness of the Dukul Formation varies in thickness but typically ranges from 100 to 300 meters.