Anglesey's Precambrian rocks
Some of the oldest rocks
on the earths surface can be seen in Angelesey;
The Precambrian rocks of Holy Island
and South Stack were formed at the dynamic boundaries of the earths plates
This is what caused the twisted and
contorted rocks that you can see from Treardurr bay to South Stack
Rhoscolyn is also one of the best
places in the British Isles to see the effects of folding in sedi,entary rocks
