Thank you for this explanation. I have no doubt that biogenic factors do play a role in the weathering of the sandstones of the Clarens Formation which was previously known as the Cave Sandstone Formation because of its hollow weathering due to the presence of diagenetic calcium carbonate, the origin of which I do not know. It was possibly derived from the subsequent Drakensberg volcanism.
Yes, you should really visit. Wishing you a very good week ahead.
Clarens Formation (22)