| Computer Code: |
RN |
Preferred Map Code: |
RnS |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Grey to bluish grey, thick bedded turbiditic sandstones, conglomerates and laminated sandstones, with thin siltstone and mudstones intercalations. |
| Definition of Lower Boundary: |
Conformably overlies mudstones of the Llanbedr Formation, base being taken at the first pale green sandstone overlying the mudstones. |
| Definition of Upper Boundary: |
Conformable below siltstones of the Hafotty Formation. |
| Thickness: |
400 to 780m |
| Geographical Limits: |
Harlech Dome. |
| Parent Unit: |
Harlech Grits Group (HGG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Hell's Mouth Formation
|
| Stratotypes: |
| Partial Type Section |
Ffridd-Lwyd. Base and lower part of Formation. |
| Reference(s): |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E135
E119
E149
|
