The BGS Lexicon of Named Rock Units — Result Details

Oolite Group

Computer Code: OGP Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Tournaisian Stage (CT) — Tournaisian Stage (CT)
Lithological Description: Wellsorted 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: Not Entered (?)
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, 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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E072