Mambane et al. (2011) presented a geological analysis of an occurrence of different fault rock types at the South Boundary Fault on Cooke Shaft, in the West Rand goldfield of the Witwatersrand Basin. They refer to both pseudotachylite and pseudotachylitic breccias (below referred as PTB) being present at that location. They state that based on the conclusion of previous research, namely that “…the Hekpoort Andesite Formation (2241 ± 21 Ma) of the Transvaal Supergroup provides a maximum age for all pseudotachylite in the West Rand goldfield may therefore need revision”, had to be revised, whereas their own findings constrained “the...

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