| Computer Code: |
LF |
Preferred Map Code: |
LF |
| Status Code: |
Pending Upgrade |
| Age range: |
St David's Series (ED)
— Merioneth Series (EM) |
| Lithological Description: |
Interbedded pale siliceous and feldspathic siltstones and greenish grey to buff micaceous mudstones, locally with abundant Lingulella davisii. |
| Definition of Lower Boundary: |
Conformity and gradationally overlies mudstones of the Menevian Group. |
| Definition of Upper Boundary: |
Generally faulted, but evidence locally of angular unconformity with various lithologies of Arenig age. |
| Thickness: |
600m+ |
| Geographical Limits: |
1:50,000 Sheet 209 (St. David's) and adjacent Sheet 210, Pembrokeshire, South Wales. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Lingula Flags [Obsolete Name And Code: Use LF]
(LFS)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Nothern end of Whitesands Bay, Pembrokeshire. Cox et al. 1930. |
| Reference(s): |
| 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.] |
| 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. |
| Cox, A H, Green, J F N, Jones, O T, and Pringle, J. 1930. The St David's District: Report of the summer meeting 1930. Proceedings of the Geologists' Association, Vol.41, 412-438. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E209
E210
|
