The BGS Lexicon of Named Rock Units — Result Details

Martin Limestone Formation

Computer Code: MTL Preferred Map Code: MtL
Status Code: Full
Age range: Tournaisian Stage (CT) — Chadian Substage (CI)
Lithological Description: Mainly carbonate mudstones, but with significant grainstones, locally cross-bedded, and oolites in upper part; ranges from peritidal to marine. Extensively dolomitized.
Definition of Lower Boundary: Not exposed. Taken where limestone becomes dominant over shale (Rose and Dunham, 1977, p.28). In practice, taken in boreholes at first significant shale parting, beds below there being assigned to `Basement Beds', now renamed `Low Furness Basal Formation'.
Definition of Upper Boundary: Base of "Red Hill Oolite", now redefined as the Red Hill Limestone Formation.
Thickness: 0-135m
Geographical Limits: South Cumbria, West Cumbria.
Parent Unit: Great Scar Limestone Group (GSCL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Meathop Quarry, Grange-over-Sands (see Leviston, 1979 for section). 
Type Section  Martin Quarry (now partly filled in) (see Leviston, 1979 for section), near Dalton in Furness. 
Reference(s):
Leviston, D. 1979. A study of four localities, the Martin Limestone (Lower Carboniferous, Dinantian) of Furness and Grange-over-Sands. Proceedings of the Cumberland Geological Society, Vol.4, 3-20. 
Nicholas, C, 1968. The stratigraphy and sedimentary petrology of the Lower Carboniferous rocks south west of the Lake District. Unpublished Ph.D. thesis, University of London. 
Dunham, K C and Rose, W C C. 1941. Geology of the iron-ore field of south Cumberland and Furness. Geological Survey of Great Britain, Wartime Pamphlet, No.16. 
Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. 
Rose, W C C. 1977. Geology and Hematite deposits of South Cumbria. Economic Memoir for 1:50,000 Sheet 58 and southern part of Sheet 48. Memoir of the geological Survey of Great Britain. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E048 E039