Six unconformity-bounded stratigraphic sequences, similar in age to those known in North America, Brazil, and Russia, are recognized in the three west African intracratonic basins—the Taoudeni, Chad, and Iullemmeden basins. The correlation of these west African sequences with the Brazilian and North American cratonic sequences suggests global synchroneity to cyclical cratonic epeirogeny at least during Phanerozoic time.

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