| Computer Code: |
SNSS |
Preferred Map Code: |
SNn |
| Status Code: |
Pending Upgrade |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Dark green, buff weathering planar and cross-laminated micaceous sandstones with up to 50m of basal conglomerate. |
| Definition of Lower Boundary: |
Unconformable on Neoproterozoic volcanic and intrusive rocks. |
| Definition of Upper Boundary: |
Conformable and transitional with the overlying mudstones of the Caerfai Bay Shale Formation. |
| Thickness: |
Up to 190m (including up to 50m of basal conglomerate). |
| Geographical Limits: |
Pembrokeshire, St David's Peninsula. |
| Parent Unit: |
Caerfai Group (CIS)
|
| Previous Name(s): |
St Non's Sandstone [Obsolete Name and Code: Use SNSS]
(-1191)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Wave-cut platform and cliffs at the western end of St Non's Bay. Full thickness exposed.. |
| 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. |
| 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. |
| 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. |
| Williams, T G. 1934. The Precambrian and Lower Palaeozoic rocks of the eastern end of St David's Precambrian area Pembrokeshire. Quarterly Journal of the Geological Society, London, Vol.90, 32-75. |
| 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. |
| 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.] |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E209
|
