Geography and Geology
Sophiatown is located on one of Johannesburg's ridges called Melville Koppies. Melville Koppies lies on the Kaapvaal craton, which dates from three billion years ago. The Koppies lie at the base of lithified sediments in the form of conglomerate, quartzite, shale, and siltstone. It represents the first sea shores and shallow beds of an ancient sea. It also forms part of the lowest level of one of the world's most well known geological features, the Witwatersrand Supergroup. Several fairly narrow layers of gravel, deposited quite late in the sequence, and bearing heavy elements, made the Witwatersrand Supergroup famous. These are the gold-bearing conglomerates of the main reefs. Melville Koppies represents in microcosm most of the features of the Witwatersrand Supergroup. What it does not have is gold-bearing rock. The gold occurs millions of years later, and several kilometres higher up, in the sequence.
The Melville Koppies Nature Reserve is a Johannesburg City Heritage Site. In the last 1 000 years, Iron Age immigrants arrived and remains of their kraal walls can be found in the area.
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