| 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 [Obsolete Name and Code: Use CRX]
(-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 |
