求翻译：All of the major manganese deposits in West Africa, which included Mokta in Ivory Coast, Nsuta in Ghana and Tambao in Burkina Faso, belong to the Proterozoic supracrustal rocks of Birimian Group. The rocks consist of interlayered manganese-bearing horizons. The manganiferous Series of Tambao is intercalated in the form of a lens trending NW-SE within a sequence of Birimian leptinites, migmatites, gneisses and ampphibolites.是什么意思？

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