The BGS Lexicon of Named Rock Units — Result Details

Lanark Sandstone Formation [Obsolete Name And Code: See SWAS]

Computer Code: LKSF Preferred Map Code: LKSF
Status Code: Index Level
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Mainly red-brown or purple sandstones, well-bedded, cross-stratified, micaceous, in some cases pebbly (lithic arenites), with subordinate red-brown silty mudstone ribs and conglomerate beds.
Definition of Lower Boundary: Junction with underlying Greywacke Conglomerate, or unconformable overlap onto Silurian strata.
Definition of Upper Boundary: Unconformity at base of 'Upper Devonian' strata.
Thickness: c.1800m, estimated from outcrop width.
Geographical Limits: 1:50k Sheet 23, north-west of Carmichael, Lesmahagow to Lanark to Carstairs area.
Parent Unit: Not Entered (?)
Previous Name(s): Lower Old Red Sandstone Group (LORS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Sections along the River Clyde between Hazelbank and New Lanark. 
Reference(s):
MacPherson, K A T, Paterson, I B and Mc Adam, A D. 1998. Geology of the Hamilton district. Memoir of the Geological Survey, Sheet 23W (Scotland). 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S023