The South Stack cliffs contain some of the oldest rocks in Wales, dating back nearly 600 million years to a geological period called the Precambrian. The extensive folds in the cliff face bear witness to some of the earth movements and forces that have shaped Wales.
The layering of different materials making up the rocks is clearly visible. The sandstone (brown-orange) and mudstone (lighter grey) layers have acted differently as they've been folded: sandstone contains coarser materials and keeps its shape whereas the mudstone is more fluid and has been squashed into the gaps in-between.
The South Stack Cliffs - Anglesey - Wales
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