Which major northeast-southwest trending intracontinental rift basin formed during the Cretaceous breakup of South America and Africa in Nigeria?
Answer and explanation
Correct answer: B. the Benue Trough
- Step 1: The Benue Trough is a 1,000 km linear geological depression stretching from the Niger Delta to Lake Chad. Step 2. Formed as a failed arm (aulacogen) during the opening of the South Atlantic Ocean in the Cretaceous, it holds thick sedimentary strata with coal, lead, and zinc. Answer: the Benue Trough. Why not the others: Dahomey Embayment is coastal southwestern; Sokoto Basin is part of the Iullemmeden Basin; Chad Basin is an intracratonic sag basin.
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