The BGS Lexicon of Named Rock Units — Result Details

Linn Of Pattack Silt Formation

Computer Code: LPSI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Silty clay and clayey silt, thinly laminated, pale olive grey. Some dropstones. Coarsening upwards into ripple cross-laminated sand.
Definition of Lower Boundary: Conformable on Pattack Till Formation.
Definition of Upper Boundary: Unconformable with Ardverikie Till Formation.
Thickness: <10m
Geographical Limits: Catchments of the rivers Pattack and Mashie (at least).
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 section 250 to 350m upstream of the confluence of the River Pattack and the Allt Coire nam Plaidean. 
Partial Type Section  River cliff of the Allt Coire na Ceardaich at its confluence with the River Mashie. 
Partial Type Section  River cliff section 350m downstream of the confluence of the River Pattack and the Allt Coire nam Plaidean. 
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