This is the re-entrant where South America split away from Africa. The one
place the restored fit is not almost perfect is the corner, where the northeast
tip of Brazil substantially overlaps Africa. In Brazil, Precambrian rocks come
right to the coast, but in Africa, the misfit is the Niger Delta, underlain by
Cenozoic and Mesozoic rocks. The Precambrian rocks in Africa are inland far
enough to accommodate the tip of Brazil nicely.