The BGS Lexicon of Named Rock Units — Result Details

Lower Liddesdale Group (A) [Obsolete Name And Code: Use TYLS]

Computer Code: LRL Preferred Map Code: notEntered
Status Code: Index Level
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: An alternation of mainly marine shales and limestones, with some thin coals and seatearths.
Definition of Lower Boundary: Drawn at the base of the Dinwoodie Member where it rests conformably upon the Lower Carboniferous rocks of the Upper Border Group.
Definition of Upper Boundary: Drawn at base of the overlying Callant Limestone of the Upper Liddesdale Group.
Thickness: c.300m
Geographical Limits: Liddesdale, Dumfriesshire and Roxburghshire (now called the Borders Region).
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): Lower Limestone Group
Stratotypes:
Type Area  Liddesdale 
Reference(s):
Lumsden G I, Tulloch W, Howells M F and Davies A. 1967. The geology of the neighbourhood of Langholm. Memoir of the Geological Survey, Sheet 11 (Scotland). 
Day, J B W and others, 1970. Geology of the neighbourhood around Bewcastle. Memoir of the British Geological Survey, Sheet 12. (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E020