Computer Code: |
QCG |
Preferred Map Code: |
notEntered |
Status Code: |
Full, pending ratification |
Age range: |
Famennian Age (DA)
— Famennian Age (DA) |
Lithological Description: |
[Obsolete: use CWA, PENN, POB] An upper portion of sandstones with alternations of marl, and a lower portion of lenticular quartz-conglomerate beds with sandstones, grits and quartzites. |
Definition of Lower Boundary: |
Drawn at the base of lenticular quartz-conglomerate beds with sandstones, grits and quartzites, where they rest unconformably on Early Devonian sandstones of the Brownstones Formation. |
Definition of Upper Boundary: |
Drawn at the conformable upward passage from sandstones and marls of the Quartz Conglomerate Group into limestones and calcareous mudstones of the "Carboniferous Limestone" [generally the Lower Limestone Shale Group or its lateral equivalents]. |
Thickness: |
c.77m |
Geographical Limits: |
South Glamorgan, Cardiff, South Wales. |
Parent Unit: |
none recorded or not applicable
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Cardiff District. |
Reference(s): |
Robertson, T, 1927. South Wales Coalfield, part 2. Abergavenny, 2nd Edition.Memoirs of the Geological Survey of Great Britain, p.42. |
Heard, A and Davies, R. 1924. The Old Red Sandstone of the Cardiff district. Quarterly Journal of the Geological Society, Vol.80, 489-519. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E232
E263
E262
E249
E247
E231
|