Gabon is situated at the northwestern margin of the Congo Craton—a region of stable, ancient crust—and preserves very ancient rock units across 75% of the country, with overlying sedimentary units from the Cretaceous and other more recent periods. == Stratigraphy and tectonics == The oldest rocks in Gabon are granitoid Archean basement rocks, 2.8 to 2.6 Ga old, that span into Cameroon, Equatorial Guinea and the Republic of Congo.
Gabon is situated at the northwestern margin of the Congo Craton—a region of stable, ancient crust—and preserves very ancient rock units across 75% of the country, with overlying sedimentary units from the Cretaceous and other more recent periods. == Stratigraphy and tectonics == The oldest rocks in Gabon are granitoid Archean basement rocks, 2.8 to 2.6 Ga old, that span into Cameroon, Equatorial Guinea and the Republic of Congo.
Source: Wikipedia "Geology of Gabon" · CC BY-SA 4.0
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