The BGS Lexicon of Named Rock Units — Result Details

Townburn Sandstone Member

Computer Code: TWN Preferred Map Code: Twn
Status Code: Full
Age range: Namurian Stage (CN) — Westphalian Stage (CW)
Lithological Description: Medium- to coarse-grained sandstone with conglomeratic bands.
Definition of Lower Boundary: Unconformable on Lower Palaeozoic turbidites; locally rests on Lower Carboniferous strata.
Definition of Upper Boundary: Overlain by Lower Coal Measures strata.
Thickness: 41.55m in Crichope Linn Borehole.
Geographical Limits: Thornhill basin at Closeburn, Keir, Eccles, River Nith (Drumlanrig), Hapland, Fellend, Townhead and Morton Wood.
Parent Unit: Passage Formation (PGP)
Previous Name(s): Passage Group (Undivided) (-1879)
Crichope Sandstone Member [Obsolete Name And Code: Use TWN] (CPE)
Replaced By Townburn Sandstone Member (*871)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Between 161.39 and 202.94m in the Crichope Linn Borehole, Thornhill, 800m west of Benthead. 
Reference Section  Townburn Wood, Closeburn. In the Town Burn, 650m northeast of Barraby Farm, Closeburn. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S009 S015