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So you're wondering, "what is that unusual massive but friable pressure solution-cleaved greenish diamictite the springboks are grazing on?" Why, that's the Dwyka 3c ridge - one of the last coarse sequences of the Dwyka glaciation at the end of the Carboniferous period. Here's a nice fresh surface in the Witteberg River showing some late fracture cleavages cutting the clasts - don't worry, I had my NEW BRUNTON and I measured it to the nearest minute - and yes, it is post-folding. Wow.
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Just for comparison, here's a more weathered outcrop of the fine-grained, laminated Dwyka 4f - including a characteristic big brown dolomite/phosphate nodule.
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