The BGS Lexicon of Named Rock Units — Result Details

Coralliferous Group

Computer Code: CRX Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Telychian Age (ST) — Wenlock Epoch (SW)
Lithological Description: Grey shales and mudstones, thin calcareous grits, and argillaceous limestones with abundant corals.
Definition of Lower Boundary: Drawn at the base of the Coralliferous Group where shale rests conformably upon conglomerate of the Conglomerate Group.
Definition of Upper Boundary: Drawn at the conformable upward passage of the Limestone Beds of the Coralliferous Group with the sandstone of the Sandstone Group.
Thickness: 170m max./approx.
Geographical Limits: Marloes Bay, Pembrokeshire.(now Dyfed).
Parent Unit: Not Applicable (-)
Previous Name(s): Coralliferous Series (-3335)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Marloes Sands, Dyfed. 
Reference(s):
De La Beche, H. 1846. On the formation of rocks of south Wales and south-west England. Memoir of the Geological Survey of Great Britain, No.1. 
Jones, O T, 1921. The Valentian Series. Quarterly Journal of the Geological Society, Vol.77, p.154-157. 
Cantrill, T C and others, 1916. South Wales Coalfield, part XII, Milford. Memoir of the Geological Survey of Great Britain. 
St Joseph, J K S. 1935. A critical examination of Stricklandia lirata (J de C Sowerby) 1839, forma typica. Geological Magazine. Vol.72, 421-422. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable