| Computer Code: |
PENN |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Famennian Age (DA)
— Famennian Age (DA) |
| Lithological Description: |
Quartz conglomerates and quartz-arenites |
| Definition of Lower Boundary: |
The lower boundary is an unconformity where the basal conglomerate of the formation overlies red sandstones and mudstones of the Brownstones Formation (Owen and Rhodes, 1969). |
| Definition of Upper Boundary: |
The upper boundary is a conformable junction with the overlying mudstones of the Avon Group (formerly Cefn Bryn Shale Formation), as seen near Fairyhill [SS 471 914] (Strahan, 1907a). |
| Thickness: |
About 100m |
| Geographical Limits: |
Limited to the core of the Cefn Bryn Anticline, on Cefn Bryn [SS 51 89], Gower (Strahan, 1907a, b) |
| Parent Unit: |
Portishead Subgroup (POB)
|
| Previous Name(s): |
Quartz Conglomerate Group (South Wales)
(QCG)
|
| 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: |
|
E247
|
