South Stack Formation

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South Stack Formation
Stratigraphic range: Furongian-Tremadoc
~497–477 Ma
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Folded metamorphosed sandstones of the South Stack Formation
TypeGeological formation
Unit ofHoly Island Group
UnderliesNew Harbour Group
Overliesnot exposed
Thickness~360–1,000 m (1,180–3,280 ft)
Lithology
PrimaryMetamorphosed sandstone
OtherMetamorphosed mudstone
Location
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RegionHoly Island, Anglesey
CountryWales
Type section
Named forSouth Stack
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The South Stack Formation is a sequence of Cambro-Ordovician (Furongian to Tremadocian) 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]

File:Detail of 'South Stack Formation' - a geological term for the cliff face at Ynys Lawd (South Stack) 09.jpg
Closer view of the rock formation

References

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  1. ^ Page Module:Citation/CS1/styles.css has no content."South Stack Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 13 October 2014.
  2. ^ Page Module:Citation/CS1/styles.css has no content."The Geological Society's 100 Great Geosites". The Geological Society. 2014. Retrieved 14 October 2014.

Further reading

  • Phillips, E, 1991. Progressive deformation of the South Stack and New Harbour Groups, Holy Island, Western Anglesey, North Wales. Quarterly Journal of the Geological Society, Vol.148, p. 1091-1100
  • Shackleton, R M, 1954. The structure and succession of Anglesey and the Lleyn Peninsula. British Association for the Advancement of Science, Vol.11, p. 106-108
  • Greenly, E. 1919. Geology of Anglesey. Memoir of the Geological Survey, UK
  • Blake, J F, 1888. The Monian System of rocks. Quarterly Journal of the Geological Society, Vol.44, p. 476-480
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