| Computer Code: |
BEOQ |
Preferred Map Code: |
BeoQ |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Pelitic, semipelitic and psammitic rocks containing numerous characteristic ribs of pure white quartzite. Locally contains carbonate or graphite. |
| Definition of Lower Boundary: |
Gradational boundary with Dunalastair Semipelite Formation; boundary taken at base of first quartzite rib. |
| Definition of Upper Boundary: |
Transitional boundary with Beoil Schist Formation; boundary taken at top of last quartzite rib. |
| Thickness: |
0 - 30m; probably much tectonic thinning. |
| Geographical Limits: |
Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically in attenuated form as far west as Allt Druidhe [NN 6423 5693] and as far east as the Allt Kynachan [NN 7775 5723]. Not present east of the Loch Tay Fault, where it may have been tectonically excised;however some of the rocks of the 'Banvie Burn Series' may be equivalent. |
| Parent Unit: |
Lochaber Subgroup (DALO)
|
| Previous Name(s): |
Beoil Quartzite
(-51)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
On south-facing scarp 400m west of Lochan Beoil Chataiche and on ridge 200 - 300m to west, where maximum thickness is reached. |
| Reference(s): |
| Treagus, J E and King, G, 1978. A complete Lower Dalradian succession in the Schiehallion district, central Perthshire. Scottish Journal of Geology, Vol.14, 157-166. |
| Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). |
| Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. |
| Stephenson, D and Gould, D. 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S055
|
