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Many thin sills and some dikes younger than almost all the associated normal Karroo dolerites occur in a narrow belt that extends from Durban along coastal Natal into Zululand where it flanks Stormberg (Lebombo) volcanic rocks on the west. Characteristic features of these intrusions in the field are glassy and variolitic margins, abundant minute amygdales, and conspicuous xenoliths of typical Natal Precambrian granite and quartzo-feldspathic gneiss and schist.

They contain more silica and potash, less iron and lime, and much less magnesia than average Karroo dolerite. Petrographically they are all very similar. The holocrystalline rock has plagioclase ranging from some...

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