The African continent is the largest on the planet (~30 × 106 km2, some 21% of Earth’s continental surface), about three times the size of the U.S.A. The U.S.A. just about “fits” into central Africa—the east-west coast-to-coast distance from NY to LA is about the same as that from Mombasa in Kenya to Douala in Cameroon. Describing the geology of such a chunk of real estate is a daunting task. When the Geological Society of America celebrated its centenary in 1988, it aimed at documenting the geological history of North America in 71 volumes. A monumental undertaking...

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