Research-paper
A review of the stratigraphy of Dange Formation (Paleocene), Northwestern Nigeria
Okosun, Edward A.
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Abstract
A detailed lithostratigraphic study of the Dange Formation (Paleocene) from boreholes cores, surface outcrops and pit profiles shows the formation to consist of grey shale, brown shale, marl, black shale and siltstone facies. The marl occurs as intercalations in the grey shale, the black shale and black siltstone facies occur as interbeds of moderate thickness below the oldest marl bed. Silty shale may form a transitional facies between the formation and the underlying Wurno Formation, otherwise the contact is sharp. Mineralogically, the grey and brown shale and siltstone fades contain thin beds and disseminations of phosphatic nodules, these fades are also gypsiferous. Ostracods and foraminifera are sparsely dispersed. Based on observed lithofacies, a new supplementary stratotype is proposed.