Geology
The Jos Plateau is dominated by three rock types. The Older Granites date to the late Cambrian and Orduvician. The Younger Granites are emplacements dating to the Jurassic, and forming part of a series that includes the Aïr Massif in the central Sahara. There are also many volcanoes and sheets of basalt extruded since the Pliocene (Morgan 1983).
The Younger Granites contain tin which was mined during and after the colonial period.
Important rivers are Kaduna, Gongola, Hadejia and Yobe, which have their source in this place.
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