| Computer Code: |
SWTN |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Floian Age (OFL)
— Darriwilian Age (ODW) |
| Lithological Description: |
Breccia of mudstone and sandstone with rafts of quartzite and limestone, interbedded with heterolithic sandstone-mudstone units. Locally units of massive unfossiliferous limestone and quartzite. |
| Definition of Lower Boundary: |
Stratigraphic contact with Porth Trefadog Volcanic Formation (POTRF) or unconformably overlying Cambro-Ordovican Holy Island Group rocks. |
| Definition of Upper Boundary: |
Uncoformably overlain by Porth Wen Group (PORW) or Llyn Alaw Group (ALAW) rocks. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Anglesey. |
| Parent Unit: |
Cemaes Group (CMES)
|
| Previous Name(s): |
Porth Yr Ogof Formation
(POGF)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
