The BGS Lexicon of Named Rock Units — Result Details

Ardverikie Till Formation

Computer Code: ARDT Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Stony sandy clay diamicton with angular to subrounded clasts up to boulder size; a typical lodgement till. Locally overlying a unit of deformation till derived from the destruction of underlying Linn of Pattack Silt Formation.
Definition of Lower Boundary: Unconformable on (1) Linn of Pattack Silt Formation, or (2) Pattack Till Formation, or (3) bedrock.
Definition of Upper Boundary: Conformable with units of outwash sand and gravel, morainic deposits or peat, etc.
Thickness: <12m
Geographical Limits: Whole of Sheet 63E and beyond.
Parent Unit: Central Grampian Glacigenic Subgroup (CGDR)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  River cliff of River Pattack at its confluence with the Allt Beinn Eilde. 
Partial Type Section  River cliff section 250 to 350m upstream of the confluence of the River Pattack and the Allt Coire nam Plaidean. 
Reference Section  River cliff of the Allt Coire na Ceardaich at its confluence with the River Mashie. 
Reference(s):
Merritt, J W, 1999. The Quaternary geology of the Dalwhinnie District. British Geological Survey Technical Report WA/99/14R. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S063 S064 S064