The BGS Lexicon of Named Rock Units — Result Details

Swithland Formation

Computer Code: SWSL Preferred Map Code: SG
Status Code: Full
Age range: Comley Series (EC) — Comley Series (EC)
Lithological Description: Purple to grey slaty meta-mudstones and greywackes with thin conglomeratic sandstones.
Definition of Lower Boundary: Passes down to coarse-grained greywackes interbedded with silty mudrocks, of the Brand Hills Formation.
Definition of Upper Boundary: Not seen or proved in this area.
Thickness: 400m+
Geographical Limits: From The Brand/Swithland Wood area, north to Charnwood Forest Golf Course; last seen at Nanpantan.
Parent Unit: Brand Group (CBA)
Previous Name(s): Swithland Greywacke Formation [Obsolete Name And Code: Use SWSL] (CBSG)
Swithland Slates (-1214)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Little John area. 
Reference Section  Groby Upper Park. 
Type Section  Brand Estate and Swithland Woods. 
Reference(s):
Moseley, J and Ford, T D, 1985. A stratigraphic revision of the Late Precambrian rocks of Charnwood Forest, Leicestershire. Mercian Geologist, Vol.10(I), 1-18. 
McIlroy, D, Brasier, M D and Moseley J. 1998. The Proterozoic - Cambrian transition within the 'Charnian Supergroup' of central England and the antiquity of the Ediacara fauna. Journal of the Geological Society of London, Vol. 155, 401 - 413. 
Watts, W W, 1947. Geology of the ancient rocks of Charnwood Forest, Leicestershire. Leicester: Leicester Literary and Philosophical Society. 
Carney, J N, 1994. Geology of the Thringstone, Shepshed and Loughborough districts (SK41NW, SK41NE and SK51NW). British Geological Survey Technical Report WA/94/08. 
Worssam, B C and Old, R A, 1988. Geology of the country around Coalville. Memoir of the British Geological Survey, Sheet 155 (England and Wales) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155 E141