Computer Code: |
CGBH |
Preferred Map Code: |
CB |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Gneissose to migmatitic semipelite, locally muscovitic and garnetiferous; minor and local lenses of quartzite and units of micaceous psammite.
Main lithology: gneissose semipelite (SPELGN); trace lithology: quartzite (QZITE), micaceous psammite (PSAMI). |
Definition of Lower Boundary: |
Not exposed - interbanded with psammites of the Dava Subgroup (undifferentiated). |
Definition of Upper Boundary: |
Conformable contact with the structurally overlying Beinn Bhreac Psammite Formation (BBPS); no way-up criteria. |
Thickness: |
none recorded or not applicable
|
Geographical Limits: |
Central Highlands of Scotland, SE of Loch Ness. Strathnairn to Slochd area. |
Parent Unit: |
Dava Subgroup (DAVA)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Summit and NE ridge of Creag Bhuide [NH 664 314]. |
Reference Section |
Meall na Fuar-ghlaic [NH 698 325]. |
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: |
S074
S074
|