| Computer Code: |
BAG |
Preferred Map Code: |
BaGS |
| Status Code: |
Full |
| Age range: |
St David's Series (ED)
— St David's Series (ED) |
| Lithological Description: |
Coarse grained turbiditic sandstone and subordinate mudstone. |
| Definition of Lower Boundary: |
Conformable on siltstones and mudstones of the Hafotty Formation. |
| Definition of Upper Boundary: |
Sharply and conformable overlain by silty mudstone of the Gamlan Formation. |
| Thickness: |
60-230m |
| Geographical Limits: |
Harlech Dome. |
| Parent Unit: |
Harlech Grits Group (HGG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Above Barmouth, North Wales. See Allan and Jackson, 1985. |
| Reference(s): |
| Matley, C A and Wilson, T S. 1946. The Harlech Dome, North of the Barmouth Estuary. Quarterly Journal of the Geological Society of London, Vol.102, 1-40. |
| Allen, P M, and Jackson, A A. 1985. Geology of the country around Harlech. Memoir of the British Geological Survey, Sheet 135 with part of Sheet 149 (England and Wales). (London: HMSO.) 112 pp. |
| Crimes, T P. 1970. A facies analysis of the Cambrian of Wales. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 7, 113-170. |
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E119
E135
E149
|
