The BGS Lexicon of Named Rock Units — Result Details

Stable Pit Member

Computer Code: CBSP Preferred Map Code: CBSP
Status Code: Full
Age range: Cambrian Period (E) — Cambrian Period (E)
Lithological Description: Locally variable, ranging from pale grey, medium-grained, cross-bedded quartz arenite to dark maroon-grey, parallel-bedded, massive to graded graywacke sandstone.
Definition of Lower Boundary: Unexposed, but possibly a rapid transition from conglomeratic beds of the underlying Swithland Camp Member into fine-grained sandstones and siltstones at the base of the Stable Pit Member.
Definition of Upper Boundary: Unexposed, but probably an upwards fining transition to grey, slaty mudrocks of the overlying Swithland Formation.
Thickness: 0 - 30 m.
Geographical Limits: Outcrops discontinuously between Stable Pit and the Brand Hills.
Parent Unit: Brand Hills Formation (BRHI)
Previous Name(s): Stable Pit Quartzite Member (-2060)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Quartz arenite facies. Stable pit, Bradgate Park. 
Partial Type Section  Greywacke/sandstone facies. Brand Hills, at 'The Brand' estate. 
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. 
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) 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155