| Computer Code: |
OGP |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Tournaisian Age (CT) |
| Lithological Description: |
[Obsolete: use CLD]
Well sorted richly fossilferous crinoidal oolites with much secondary dolomite. |
| Definition of Lower Boundary: |
Drawn at the base of the Oolite Group where it rests conformably upon the Lower Limestone Shales Formation. |
| Definition of Upper Boundary: |
Drawn at the unconformity upwards from the Oolite Group to the base of the Calcite-Mudstone Group. |
| Thickness: |
About 50 m thick. |
| Geographical Limits: |
Clydach Valley, Powys. |
| 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 |
Clydach Valley, Mid Glamorgan. |
| Reference(s): |
| George, T N. 1954. Pre-Seminulan Main Limestone of the Avonian Series in Breconshire. Quarterly Journal of the Geological Society of London, Vol.110, 282-322. |
| George, T N, 1956. Carboniferous Main Limestone of the East Crop in South Wales. Quarterly Journal of the Geological Society, Vol.III, p.311. |
| George, T N, 1958. Lower Carboniferous palaeogeography of the British Isles. Proceedings of the Yorkshire Geological Society, Vol.31, p.249. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E072
|
