The geology of the country around Zanzibar, an explanation of that part of the Quarter Degree Sheet 2228C, lying within Botswana by R.M. Key (1979).

The geology of an area of about 400 square kilometres along the north bank of the Limpopo River is described. Four major rock units are recognised which form part of the Central zone of the Limpopo mobile belt-an Archaean to early Proterozoic tectonic domain. The oldest rocks, the Zanzibar gneiss, contains a suite of mafic dykes (dated at about 2960 million years B.P.) not recognised in the overlying granitoid and metamorphic rocks forming the G1 gneisses and G2 migmatites.