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): |
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.] 112pp. |
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. |
Crimes, T P. 1970. A facies analysis of the Cambrian of Wales. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol.7, 113-170. |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E119
E135
E149
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