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
|