The BGS Lexicon of Named Rock Units — Result Details

Caerfai Group

Computer Code: CIS Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Comley Series (EC) — St David's Series (ED)
Lithological Description: Reddish, basal conglomerate, green, fine-grained micaceous sandstone, purple-red mudstone and purple-red micaceous sandstone.
Definition of Lower Boundary: Drawn at base of basal conglomerate of the Caerfai Group where it rests unconformably on slates and tuffs of the Ogofgolchfa Group.
Definition of Upper Boundary: Drawn at conformable upward passage from purple-red sandstone of the Caerbwdy Sandstone to coarse, pebbly sandstone of the Solva Group.
Thickness: 400m approx.
Geographical Limits: South-west Wales.
Parent Unit: Not Applicable (-)
Previous Name(s): Caerfai Beds (-3929)
Caerfai Formation (-3930)
Caerfai Series (-1431)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Caerfai Bay, near St. David's, Dyfed, Wales. 
Reference(s):
Cowie, J W, Rushton, A W A and Stubblefield, C J, 1972. A correlation of Cambrian rocks in the British Isles. Special Report of the Geological Society of London, No.2, p.26. 
Hicks, H, 1881. The classification of the Eozoic and lower Palaeozoic rocks of the British Isles. Popular Science Review. Vol.5, p.289. 
Jones, O T. 1931. The Cambrian Rocks. "In" Cox, A H and others. The Geology of St. David's district, Pembrokeshire. Proceedings of the Geologists' Association, Vol.41, p.253. 
Pringle, J and George, T N, 1948. South Wales. British Regional Geology. 
Jukes-Browne, A J. 1912. The Student's Handbook of Stratigraphical Geology, p.80. London. 
Hicks, H. 1894. On some life Zones in the Lower Palaeozoic rocks. Geological Magazine (4), Vol.1. p.7. 
Green, J F N. 1908. The geological structure of the Saint David's area (Pembrokeshire). Quarterly Journal of the Geological Society of London, Vol.64, 363-383. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable