The BGS Lexicon of Named Rock Units — Result Details

Thirlstane Beds

Computer Code: THSD Preferred Map Code: THSD
Status Code: Full
Age range: Holkerian Substage (CQ) — Holkerian Substage (CQ)
Lithological Description: Fine-grained, well sorted, pale grey quartz sandstone characterised by large-scale cross-bedding and soft sediment liquefaction structures.
Definition of Lower Boundary: Sharp base on marine mudstones of the Powillimount Sandstone Formation.
Definition of Upper Boundary: The Thirlstane Sandstone Member lies conformably under the Arbigland Limestone Formation.
Thickness: 25m
Geographical Limits: Powillimount shore, Southerness, Kirkcudbrightshire, south-western Scotland (Southern Uplands).
Parent Unit: Powillimount Sandstone Member (POSD)
Previous Name(s): Thirlstane Sandstone Formation (-1862)
Thirlstane Sandstone Member (-4925)
Thirlstane Sandstone [Obsolete: Use THSD] (THI)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Coastal section 500m ENE of Powillimount Farm, Southerness, Kirkcudbrightshire. 
Reference(s):
Craig, G Y. 1956. The Lower Carboniferous outlier of Kirkbean, Kirkcudbrightshire. Transactions of the Geological Society of Glasgow, Vol. 22, 113 - 132. 
Deegan, C E. 1970. The petrology and sedimentology of the Lower Carboniferous rocks between White Port and Kirkbean, Kirkcudbrightshire. University of Wales, Aberystwyth PhD Thesis (unpublished). 
Ord, D M, Clemmy, H and Leeder, M R, 1988. Interaction between faulting and sedimentation during Dinantian extension of the Solway basin. Journal of the Geological Society of London, 145, 249-259. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S006 S005 S006