| Computer Code: |
CDN |
Preferred Map Code: |
CaS |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
[Obsolete: use NOG] Black mudstone and silty mudstone. |
| Definition of Lower Boundary: |
Overlies tuffs of Snowdon Volcanic Group. |
| Definition of Upper Boundary: |
Base of overlying Conwy Mudstone Formation and equivalent units of Ashgill age. |
| Thickness: |
450m |
| Geographical Limits: |
Northern and central Snowdonia. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Railway cutting, Conwy. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E119
E094
|
