| Computer Code: |
CRAN |
Preferred Map Code: |
LO |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Interbanded psammite and micaceous psammite, siliceous psammite, quartzite and semipelite. |
| Definition of Lower Boundary: |
Not exposed in the Laggan Inlier. |
| Definition of Upper Boundary: |
Conformably overlain by An Stac Semipelite and Psammite Formation (ANST), with transitional contact; defined by the incoming of a predominantly semipelite units. |
| Thickness: |
Up to 200 m exposed. |
| Geographical Limits: |
Central Highlands of Scotland. Glen Banchor and Kincraig inliers. |
| Parent Unit: |
Glen Banchor Subgroup (GLBA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Creag an Loin hill at [NH 696 014], north of Newtonmore. |
| Reference Section |
Eastern flanks of Sron Beag na h-Uamhaidh [NN 6437 9755]. |
| 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
S064
S074
|
