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Compared with other layered intrusions, the Bushveld Complex occupies an area about 26,000 square miles in extent.

The Complex consists essentially of five adjoining, basin-shaped masses of igneous-rocks. The outline of the whole mass is accordingly lobulate. The Bushveld episode was evidently initiated by the outpouring of andesitic lava on three occasions, and of agglomerate and tuff on one occasion, during the deposition of the Transvaal System.

Sills of diabase in the Transvaal System represent the first intrusive phase of the Complex.

The Epicrustal rocks, so-called because they formed close to and at surface, include felsite, granophyre, microgranite and...

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