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DescriptionWitwatersrand outcrops 2.jpg
English: The outcrops of the Witwatersrand Supergroup (yellow) centered around the Vredefort Dome, with a detail of the outcrop on which Johannesburg is situated. The red line indicates the Witwatersrand ridge that gave its name to the area and its rocks. The main gold bearing reef to the south of Johannesburg is indicated by the purple line
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