South Stack Formation

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South Stack Formation
Stratigraphic range: Ediacaran
Sea cliff at South Stack - - 113500.jpg
Folded metamorphosed sandstones of the South Stack Formation
TypeGeological formation
Unit ofHoly Island Group
UnderliesNew Harbour Group
ThicknessApprox. 360 to >1000m
Type section
Named forSouth Stack

The South Stack Formation is a sequence of late Neoproterozoic metasedimentary rocks exposed in northwestern Anglesey, North Wales.[1] The outcrop of this formation at South Stack was chosen as one of the top 100 geosites in the United Kingdom by the Geological Society of London, for its display of small-scale folding.[2]


  1. ^ "South Stack Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 13 October 2014.
  2. ^ "The Geological Society's 100 Great Geosites". The Geological Society. 2014. Retrieved 14 October 2014.