The Sudan trough in French West Africa is located between the central Saharan massif and the west African shield. It was produced in a zone of weakness in a vast rigid group of crystalline rocks and has been in existence since Cenomanian (Cretaceous) time. Sedimentation in the trough has been sporadic; the formations are neither extensive nor thick. Structural phases strongly developed in the northern part of the central Saharan massif are weakly recorded here.

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