| Computer Code: |
BEOS |
Preferred Map Code: |
BeoS |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Schistose muscovite-rich pelite with a scattered garnet porphyroblasts and pods of vein quartz. Unusually mica-rich. Locally contains sporadic carbonate or graphite. |
| Definition of Lower Boundary: |
Transitional boundary with Beoil Quartzite Formation; boundary taken at top of last quartzite rib. |
| Definition of Upper Boundary: |
Apparently transitional boundary with Meall Dubh Striped Pelite; highly tectonised. |
| Thickness: |
5 - 90m ; probably much tectonic thinning. |
| Geographical Limits: |
Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically as far west as Allt Druidhe [NN 642 5712] and as far east as the Tomintianda Burn [NN 809 606]. Not present east of the Loch Tay Fault, where it is tectonically excised; however some of the rocks of the 'Banvie Burn Series' may be equivalent. |
| Parent Unit: |
Lochaber Subgroup (DALO)
|
| Previous Name(s): |
Beoil Schist
(-686)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
On south-facing scarp 700m west of Lochan Beoil Chataiche. |
| Reference(s): |
| 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. |
| 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). |
| 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
|
