The BGS Lexicon of Named Rock Units — Result Details

Ben Ledi Grit Formation

Computer Code: BLEG Preferred Map Code: BLGF
Status Code: Full
Age range: Ediacaran Period (AD) — Comley Series (EC)
Lithological Description: Metasandstone, arenite to wacke, pale to dark grey, fine- to very coarse-grained, locally gritty and pebbly, interbedded with semipelite and pelite; contains brown-weathering calcareous nodules in upper part. Generally becomes coarser-grained upwards.
Definition of Lower Boundary: Outgoing of chloritic and epidotic, pale to dark green and grey rocks or outgoing of clean, coarse arenites and incoming of more matrix-rich arenites and wackes.
Definition of Upper Boundary: Outgoing of chloritic and feldspathic coarse arenites and wackes and incoming of clean arenites (base of Keltie Water Grit and Loch Ard Grit formations).
Thickness: In excess of 2000m (estimated)
Geographical Limits: Southern Highland Group outcrop across southern Highlands of Scotland, from Glen Clova and Glen Esk to the Kintyre peninsula, Argyllshire.
Parent Unit: Southern Highland Group (SOHI)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Ledard Burn, Kinlochard, north of Loch Ard, Aberfoyle, Perthshire. 
Type Section  Type section/area. Milton Glen Burn section and surrounding area of Ben Ledi, north of Loch Venachar, Perthshire, on southeast limb of Ben Ledi Antiform. 
Reference Section  From north side of Stuc a' Chroin (Coire Fhuadaraich). South-south-east down Gleann a' Chroin to the Keltie Water. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038 S038 S039 S046 S047 S047