Differential Weathering Patterns

Hiking on the Wild Coast of South Africa was a wonderful experience, heightened by the ever-changing patterns in the Ecca Shales which occur throughout the region traversed.  These rocks display the most beautiful shapes and textures resulting from differential weathering and erosion and the following images illustrate some of what was seen.

These features result from differing degrees of cementation caused by the migration of cementing agents along joints and fractures and around loci within the rocks. When these are exposed, the better cemented and, therefore, harder sections form positive features, whilst the softer portions of the rock are removed.

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