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 Series [Obsolete Name and Code: Use CIS]
(-1431)
Caerfai Beds [Obsolete Name and Code: Use CIS] (-3929) Caerfai Formation [Obsolete Name and Code: Use CIS] (-3930) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Caerfai Bay, near St. David's, Dyfed, Wales. | ||
| Reference(s): | |||
| Pringle, J and George, T N, 1948. South Wales. British Regional Geology. | |||
| Hicks, H, 1881. The classification of the Eozoic and lower Palaeozoic rocks of the British Isles. Popular Science Review. Vol.5, p.289. | |||
| Jukes-Browne, A J. 1912. The Student's Handbook of Stratigraphical Geology, p.80. London. | |||
| 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. | |||
| 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. | |||
| Hicks, H. 1894. On some life Zones in the Lower Palaeozoic rocks. Geological Magazine (4), Vol.1. p.7. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||