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
|