The BGS Lexicon of Named Rock Units — Result Details

Dalton Formation

Computer Code: DLB Preferred Map Code: DlF
Status Code: Full
Age range: Arundian Substage (CJ) — Arundian Substage (CJ)
Lithological Description: At base, mid to dark grey even-bedded carbonate grainstones and packstones; middle part, dark grey thinly bedded packstones and wackestones with many shaly interbeds; upper part, even bedded packstones and grainstones.
Definition of Lower Boundary: At siltstone parting at top of Redhill Limestone Formation, exposed in road-cutting on north side of Elliscales roundabout on Dalton bypass, A590, Furness.
Definition of Upper Boundary: Base of overlying Park Limestone.
Thickness: 90-255m
Geographical Limits: South Cumbria, north Lancashire.
Parent Unit: Great Scar Limestone Group (GSCL)
Previous Name(s): Dalton Beds (-3995)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Dalton bypass, A590, Furness exposures in road cuttings and Elliscales Quarry. 
Reference Section  Plumpton Quarries, Ulverston. Quarry and natural sections. 
Reference(s):
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