| Computer Code: |
BTU |
Preferred Map Code: |
symb |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Heterogeneous package of variably gneissose psammite, pelite, semipelite and quartzite; interbanded on the metre scale. |
| Definition of Lower Boundary: |
Upon the Lochailort Pelite Formation (MBLA), likely conformable. |
| Definition of Upper Boundary: |
Likely conformable contact with the overlying Druim na Saille Pelite Formation (DRSP) in the south; north and east of Loch Arkaig directly overlain by the Loch Eil Group (LEIL). |
| Thickness: |
Highly variable, possibly up to 2-3 km. |
| Geographical Limits: |
Northern Highlands of Scotland, from Loch Sunart to Loch Mullardoch. Restricted to the Sgurr Beag Nappe. |
| Parent Unit: |
Glenfinnan Group (GLEN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Strachan, R A, May, F and Barr, D, 1988. The Glenfinnan and Loch Eil Divisions of the Moine Assemblage. 32-45 IIV Winchester, J A (editor). Later Proterozoic stratigraphy of the Northern Atlantic regions (Glasgow and London: Blackie). |
| Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
| Brown, R L, Dalziel, I W D, and Johnson, M R W. 1970. A review of the structure and stratigraphy of the Moinian of Ardgour, Moidart and Sunart - Argyll and Inverness-shire. Scottish Journal of Geology, Vol. 6, 309-335. |
| Dalziel, I W D, 1966. A structural study of the granitic gneiss of western Ardgour, Argyll and Inverness-shire. Scottish Journal of Geology, Vol.2, 125-152. |
| Holdsworth, R E, Strachan, R A and Harris, A L, 1994. Precambrian rocks in northern Scotland east of the Moine Thrust: The Moine Supergroup in Gibbons, W and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, No.22. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S052
S053
S062
S061
S053
S061
|
