The BGS Lexicon of Named Rock Units — Result Details

Upper Border Group [Obsolete Name And Code: Use TYLS]

Computer Code: UBO Preferred Map Code: notEntered
Status Code: Index Level
Age range: Holkerian Substage (CQ) — Asbian Substage (CR)
Lithological Description: Interbedded mudstones, siltstones and sandstones, with marine limestones and a few coals; local volcanic rocks.
Definition of Lower Boundary: At base of Glencartholm Volcanic Beds (Langholm) or base of Clattering Band (Bewcastle).
Definition of Upper Boundary: Conformable upward passage to Lower Liddesdale Group: at base of Dinwoodie Beds.
Thickness: 670m
Geographical Limits: Langholm and Bewcastle areas of Northumberland Trough.
Parent Unit: Not Entered (?)
Previous Name(s): Border Group, Upper [Obsolete Code: Use UBO] (-3741)
Alternative Name(s): Border Group
Scremerston Coal Group
Stratotypes:
Type Area  Langholm area. (Lumsden and others, 1967). 
Reference Section  Archerbeck Borehole. 2528' to bottom of bore. (Lumsden and Wilson, 1961). 
Reference(s):
Day, J B W and others, 1970. Geology of the neighbourhood around Bewcastle. Memoir of the British Geological Survey, Sheet 12. (England and Wales). 
Lumsden G I and Wilson R B. 1961. The stratigraphy of the Archerbeck Borehole, Canonbie Dumfriesshire. Bulletin of the Geological Survey of Great Britain, No.18, 1-89. 
George, T N, Johnson, G A L, Mitchell, M, Prentice, J E, Ramsbottam, W H C, Sevastopulo, G D and Wilson, R B. 1976. A correlation of the Dinantian rocks of the British Isles. Special Report of the Geological Society of London, No 7. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable