The BGS Lexicon of Named Rock Units — Result Details

Border Group, Middle [Obsolete: use FELL]

Computer Code: MBG Preferred Map Code: notEntered
Status Code: Index Level
Age range: Arundian Substage (CJ) — Holkerian Substage (CQ)
Lithological Description: [Obsolete: use FELL] Obsolete term Border Group, Middle is replaced by Fell Sandstone Formation, Lumsden et al, 1968; Day, 1970.
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: none recorded or not applicable
Geographical Limits: none recorded or not applicable
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
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:
none recorded or not applicable