| Computer Code: |
CFBS |
Preferred Map Code: |
CaB |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Purplish red mudstones with some siltstone beds and laminae, cross-bedded in lower part and with units of crystal tuff in the upper part. |
| Definition of Lower Boundary: |
Conformably overlies the St Non's Sandstone Formation. |
| Definition of Upper Boundary: |
Passes upwards conformably by increase in grain size into the Caerbwdy Sandstone Formation. |
| Thickness: |
15m |
| Geographical Limits: |
1:50,000 Sheet 209 (St Davids) and adjacent Sheet 210, Pembrokeshire. |
| Parent Unit: |
Caerfai Group (CIS)
|
| Previous Name(s): |
Cairfai Bay Shales Formation [Obsolete Name And Code: Use CFBS]
(CABA)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Cliffs on west and east side of Caerfai Bay, 1.6km southeast of St David's, Pembrokeshire. Cowie, Rushton, and Stubblefield, 1972. |
| Reference(s): |
| Cox, A H, Green, J F N, Jones, O T, and Pringle, J. 1930. The Geology of the St David's district, Pembrokeshire. Proceedings of the Geologists' Association, Vol. 41, 241-273. |
| Harkness, R and Hicks, H. 1871. On the ancient rocks of the St David's promontary, South Wales, and their fossil contents. Quarterly Jounrnal of the Geological Society of London, Vol.27, 384-404. |
| Thomas, H H and Jones, O T, 1912. On the Pre-Cambrian and Cambrian rocks of Brawdy, Haycastle and Brimaston, (Pembrokeshire). Quarterly Journal of the Geological Society of London, Vol.68, 374-401. |
| Rushton, A W A. 1974. The Cambrian of Wales and England, 43-121 in Holland, C H (editor), The Cambrian of the British Isles, Norden and Spitzbergen (Lower Palaeozoic rocks of the world, 2). [London: John Wiley and Son.] |
| 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: |
|
E209
|
