Word: eburnean
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Dates: during 1960-1969
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...African regions are divided neatly by a boundary running northeast through Ghana, Togo, Dahomey, Upper Volta, Niger, Mali, and into Algeria (see map). To the east of the boundary lies the Pan-African region, dated as 550 million years old. West of it is the 2-billion-year-old Eburnean area. According to Bullard, if the South American bulge had once fitted under the bulge of Africa, the continuance of the delineation between the two rock regions would be found running southwest through Brazil from a point near the city of Sao Luis 2,070 miles north...
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