| Computer Code: |
BUVO |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Abereiddian Stage (O2)
— Abereiddian Stage (O2) |
| Lithological Description: |
Red agglomerate and ashes, fine-grained grey ashes and shales, pebbly feldspar ashes, bouldery spilitic ashes, spilites, felsite agglomerate, keratophyres, breccias and ashes. |
| Definition of Lower Boundary: |
Drawn at the base of the red agglomerate and ashes formation where they rest unconformably upon the Landrindod and Shale Group. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage of the keratophyres, breccias and ashes group with the base of the Newmead Group. |
| Thickness: |
609 m. |
| Geographical Limits: |
Radnorshire, near Builth Wells. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Builth Volcanic Formation [Obsolete Name And Code: Use BUVO]
(BUV)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Maen-Gowan, 3 km northeast of Builth, Radnorshire. |
| Reference(s): |
| Schofield, D I, Davies, J R, Waters, R A, Williams, M and Wilson, D. 2004. The Builth Wells District - a brief explanation of the geology. Sheet explanation of the British Geological Survey 1:50 000 Sheet 196 Builth Wells (England and Wales). (Keyworth, Nottingham: British Geological Survey). |
| George, T N. 1970. British Regional Geology, South Wales, Third Edition. British Geological Survey. |
| Jones, O T and Pugh, W J. 1941. The Ordovician rocks of the Builth District. A preliminary account. Geological Magazine, Vol.78, p.190. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
