While looking for sites of relics from the South African war we came across a few of these rocks, they really intregued us, not knowing what they were we consulted Dr Sux Zietsman (retired geologist) and got the following reply ….”these rocks are shales from the Timeball Hill Formation of the Transvaal Supergroup. Those “ridges” are indeed mudcracks filled with  more resistant sediments. These more resistant crack- fillings are more resistant to weathering (contains ...


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