Folded Greywacke

 

Greywacke is the ocean-bottom sludge that once lay between England and Scotland, and now forms the Southern Uplands. At that hill range's eastern end, the sea carves out a nice cross-section to show how the layers have been lifted upright and bent about by the collision of the two continents. Pettico Wick, greywacke just north of St Abbs Head, Berwickshire.

 

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