Which post-Santonian sedimentary basin in southeastern Nigeria hosts thick sub-bituminous coal deposits and major natural gas reserves?

Answer and explanation

Correct answer: B. the Anambra Basin

  1. Step 1: Following the Santonian tectonic inversion of the Benue Trough, the depocenter shifted westward to create the Anambra Basin. Step 2. It contains Campanian-Maastrichtian formations (Mamu and Ajali formations) rich in coal seams and substantial natural gas reservoirs. Answer: the Anambra Basin. Why not the others: Sokoto Basin contains phosphates and limestone; Chad Basin is in the far northeast; Mid-Niger (Bida) Basin is in Niger/Kogi.

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