The BGS Lexicon of Named Rock Units — Result Details

Breakyneck Scar Limestone Formation

Computer Code: BRE Preferred Map Code: BRE
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: Dark grey, bioclastic, unevenly bedded limestones with interbedded dark grey shaly mudstones. (Between underlying dolomites, oolites, conglomerates and sandstones of the Brownber Formation and overlying orthoquartzites of the Ashfell Sandstone.
Definition of Lower Boundary: (Contact between this formation and the Brownber Formation is exposed at NY 6103 0923 and NY 6125 0925, but the former is only c.25m thick there).
Definition of Upper Boundary: Cannot be defined precisely.
Thickness: Approx. 150 metres. Thinning rapidly westwards to c.75 metres north of Newbiggin on Lune and c.25 metres near Howe Nook, Orton.
Geographical Limits: Not defined.
Parent Unit: Great Scar Limestone Group (GSCL)
Previous Name(s): Michelinia Grandis Beds [Obsolete Name And Code: See BRE] (MCHG)
Michelinia grandis Zone [Obsolete Name and Code: Use BRE] (-2634)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Valley of Scandal Beck, Ravenstonedale, Cumbria. 1:50,000 Sheet 40. A large part of the exposure in the section is at Breakyneck Scar. 
Reference(s):
Pattison, J. 1990. Geology of the Orton and Sunbiggin Tarn districts. Geological notes and local details for 1:10,000 Sheets NY60NW and NY60NE and part of 1:50,000 Sheets 30 (Appleby), 31 (Brough), 39 (Kendal) and 40 (Kirkby Stephen). British Geological Survey Onshore Geology Series, Technical Report, WA/90/12. 
Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E040