| Computer Code: |
LLBS |
Preferred Map Code: |
LlbS |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Purple and blue-grey silty mudstones and subordinate coarse-grained turbiditic sandstones. |
| Definition of Lower Boundary: |
On felsic tuff of the Bangor Formation or a conformable contact with sandstone of the Fachwen Formation. |
| Definition of Upper Boundary: |
Silty mudstones of the Formation are sharply but generally conformably overlain by coarse-grained or conglomeratic sandstones of the Bronllwyd Grit Formation. |
| Thickness: |
c.1000m |
| Geographical Limits: |
Northern Snowdonia. |
| 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 |
Penrhyn slate quarry, Bethesda. |
| Reference Section |
Padern Country Park, Quarry Nature Trail. [SH 586 603]. |
| Reference(s): |
| Howells M F, Reedman A J and Leveridge B E. 1985. Geology of the country around Bangor: Explanation for 1:50 000 geological sheet 106 (England and Wales). British Geological Survey Sheet Explanation. [London: HMSO.] 34pp. |
| 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
E106
E118
|
