| Computer Code: |
TWYN |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Darriwilian Age (ODW)
— Darriwilian Age (ODW) |
| Lithological Description: |
Interbedded sandstone and conglomerate. |
| Definition of Lower Boundary: |
Conformably overlying Porth Cynfor Formation (CYNFO). |
| Definition of Upper Boundary: |
Unconformably overlain by Llanbadrig Formation (LLBG). |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Anglesey. |
| Parent Unit: |
Porth Wen Group (PORW)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Bates, D E B. 1972. The stratigraphy of the Ordovician rocks of Anglesey. Geological Journal, 8(1), 29-58. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
