| Computer Code: |
BGRV |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pridoli Epoch (SO)
— Lochkovian Age (DO) |
| Lithological Description: |
A volcanic succession of basalts, andesites, trachytes and rhyolites, including rhyolitic tuff and breccia with minor intercalations of sandstone and conglomerate. |
| Definition of Lower Boundary: |
The base of the volcanic pile above the Swanshaw Sandstone Formation in the Biggar area. |
| Definition of Upper Boundary: |
The base of the overlying Auchtitench Sandstone Formation in the Biggar area. |
| Thickness: |
At least 100 m thickness locally. |
| Geographical Limits: |
Biggar area, South Lanarkshire, Scotland. |
| Parent Unit: |
Lanark Group (LNK)
|
| Previous Name(s): |
Lavas and ashes of Old Red Sandstone age [Obsolete Name and Code: Use BGRV]
(-1352)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Biggar, South Lanarkshire Browne et al., 2001 |
| Type Section |
Parkhall Burn, 2.5 km east of Douglas, Lanarkshire Browne et al., 2001 |
| Reference(s): |
| Browne, M A E, Smith, R A, and Aitken, A M. 2002. Stratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. British Geological Survey Research Report RR/01/04. 67 pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S023
S024
|
