It is built on the Witwatersrand at an elevation of 57 0 9 ft.
A group of highly inclined quartzites, altered conglomerates and jasperoid rocks which crop out on the Umhlatuzi river, between Melmoth and Nkandhla and on the White Umfolosi river above Ulundi Ph ins, is considered by Anderson to represent some portion of the Lover Witwatersrand series.
This edge is marked by ranges of hills such as the Witwatersrand, Witwatersberg and Magaliesberg; the Witwatersrand, which extends eastward to Johannesburg, forming the watershed between the rivers flowing to the Atlantic and Indian Ocean.
Ac cording to Molengraaff it includes the two following series: - An upper group including the auriferous conglomerates of the Rand: Witwatersrand Series.
Their chief occurrences are in the districts of Witwatersrand, Heidelberg, Klerksdorp and Venterskroon.