| 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
|
