The BGS Lexicon of Named Rock Units — Result Details

Creag Liath Psammite Formation

Computer Code: CGLH Preferred Map Code: LI
Status Code: Full
Age range: Tonian Period (AT) — Tonian Period (AT)
Lithological Description: Interbanded gneissose psammite, siliceous psammite with subordinate micaceous psammite and semipelite. Distinctive porphyroclasts of K-feldspar common.
Definition of Lower Boundary: Typically a shear zone with structurally underlying striped semipelites of the An Stac Semipelite and Psammite.
Definition of Upper Boundary: Unconformity / stratigraphical break with overlying Grampian and Appin Group rocks.
Thickness: 220 m +
Geographical Limits: Central Highlands of Scotland. Glen Banchor - Kincraig area.
Parent Unit: Glen Banchor Subgroup (GLBA)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Creag Liath - NE and SW flanks of the mountain. 
Reference Section  Creag na H'iolare - basal contacts and lower parts. 
Reference Section  Unnamed burn 300 m west of Gergask Crag. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable