The BGS Lexicon of Named Rock Units — Result Details

Middle Limestone Formation

Computer Code: MLG Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Brigantian Substage (CX) — Brigantian Substage (CX)
Lithological Description: Limestones, sandstones, shales and coals. Fossiliferous.
Definition of Lower Boundary: Drawn at the base of the Oxford Limestone Member where it rests conformably upon the Crosshill Limestones Member. Boundary defined on palaeontological grounds only.
Definition of Upper Boundary: Drawn at the conformable upward passage of the Middle Limestone Group with the base of the Great Limestone.
Thickness: Not known.
Geographical Limits: Northumberland.
Parent Unit: Not Entered (?)
Previous Name(s): Middle Limestone Group (*600)
Upper Bernician (-397)
Alternative Name(s): Upper Liddesdale Group
Stratotypes:
Type Area  Berwick-On-Tweed. 
Reference(s):
Westoll, T S and others, 1955. A Guide to the geology of the district around Alnwick, Northumberland. Proceedings of the Yorkshire Geological Society, Vol.30, p.77. 
Smith, S, 1910. The Faunal Succession of the Upper Bernician. Transactions of the Natural History Society, Northumberland, Durham and Newcastle, Vol.3, p.595. 
Fowler, A. 1926. The geology of Berwick-upon-Tweed. Norham and Scremerston. Memoir of the Geological Survey of Great Britain. (London: HMSO.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E018 E004 E006 E008 E019 E025 E001 E002