The BGS Lexicon of Named Rock Units — Result Details

Pennard Conglomerate Formation

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: Upper Old Red Sandstone Group (ORSU)
Previous Name(s): Quartz Conglomerate [Obsolete Name And Code: Use COW] (QZC)
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used: