South Stack Formation

Short description: Cambro-Ordovician geologic formation in Wales

South Stack Formation
Stratigraphic range: Furongian-Tremadoc
~497–477 Ma

PreЄ

Folded metamorphosed sandstones of the South Stack Formation

Type| Geological formation
Unit of| Holy Island Group
Underlies| New Harbour Group
Overlies| not exposed
Thickness| ~360–1,000 m (1,180–3,280 ft)
Lithology
Primary| Metamorphosed sandstone
Other| Metamorphosed mudstone
Location
Coordinates|  [ ⚑ ] : 53°18′N 4°41′W﻿ / ﻿53.3°N 4.683°W﻿ / 53.3; -4.683
Region| Holy Island, Anglesey
Country|  Wales
Type section
Named for| South 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]

Closer view of the rock formation

## References

1. ↑ "South Stack Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=NSS. Retrieved 13 October 2014.
2. ↑ "The Geological Society's 100 Great Geosites". The Geological Society. 2014. http://apps.esriuk.com/app/GreatGeosites/3/wmt/view/5e0d44970b3a4b4dafb7da0404b2d8ed/index.html. 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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