| Computer Code: |
GRAB |
Preferred Map Code: |
GRAB |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Porphyritic lavas of hawaiite/mugearite composition. |
| Definition of Lower Boundary: |
Conformable base of lavas on pyroclastic rocks within Peat Rig Formation along Grain Burn. |
| Definition of Upper Boundary: |
Conformable top of lavas below pyroclastic rocks within Peat Rig Formation along Grain Burn. |
| Thickness: |
c.100m |
| Geographical Limits: |
Bail Hill area, 4km north west of Sanquhar, Dumfries, Scotland. |
| Parent Unit: |
Peat Rig Formation (PERG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Grain Burn. |
| Reference(s): |
| Floyd, J D. 1996. Lithostratigraphy of the Ordovician rocks in the Southern Uplands: Crawford Group, Moffat Shale Group, Leadhills Supergroup. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 86, 153-165. |
| McMurtry, M J. 1980. The Ordovician rocks of the Bail Hill area, Sanquhar, south Scotland. Volcanism and sedimentation in the Iapetus Ocean. Unpublished PhD thesis (University of St. Andrews). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S015
|
