| Computer Code: |
BLQA |
Preferred Map Code: |
B |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Cream to pinkish white quartzite and siliceous psammite with subordinate semipelite. |
| Definition of Lower Boundary: |
Conformably upon Creag an Loin Psammite Formation (CRAN); marked by incoming of distinctive garnetiferous quartzite and/or semipelite. |
| Definition of Upper Boundary: |
Conformably overlain by Creag Liath Psammite (CGLH); marked by incoming of K-feldspar-bearing psammites. |
| Thickness: |
0 - 75 m. |
| Geographical Limits: |
Central Highlands of Scotland, Laggan, Glen Banchor and Kincraig areas. |
| Parent Unit: |
Creag Liath Psammite Formation (CGLH)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
South-east flank of Mullach Sron na H'uamhaldh[NN 628 971] |
| Reference Section |
Eastern end of Blargie Craig [NN 600 953]. |
| Reference(s): |
| 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. |
| Leslie, A G, Robertson, S, Smith, M, Banks, C J, Mendum, J R, and Stephenson, D. 2013. The Dalradian rocks of the northern Grampian Highlands of Scotland. Proceedings of the Geologists' Association, Vol. 124, 263-317. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S063
|
