| Computer Code: |
TRT |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Highly weathered, medium to coarse basaltic tuff, hyaloclastite and agglomerate with interbedded volcaniclastic sediments. |
| Definition of Lower Boundary: |
Conformably overlies black mudstones of the Nod Glas Formation. |
| Definition of Upper Boundary: |
Overlain by grey mudstones and siltstones of the Conwy Mudstone Formation. |
| Thickness: |
To 70m |
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Not Available (!)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Howells, M F, Leveridge, B E, Evans, C D R and Nutt, M J C, 1981. Classical areas of British Geology. Dolgarrog. Description of 1:25 000 Sheet SH76. London: HMSO for Institute of Geological Sciences. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E106
|
