The BGS Lexicon of Named Rock Units — Result Details

Sliding Stone Slump Breccia Member

Computer Code: CMSS Preferred Map Code: CMSS
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Grey, coarse-grained volcaniclastic sandstone with abundant angular clasts and large folded and contorted rafts of grey, laminated mudstone and siltstone. Beds of volcaniclastic sandstone and siltstone become increasingly intercalated towards the top of the unit.
Definition of Lower Boundary: Sharp contact on grey, laminated tuffaceous mudstones and siltstones of the Beacon Hill Formation.
Definition of Upper Boundary: Grades upwards, by decrease in proportion of beds with mudstone rafts, into volcaniclastic sandstones and siltstones of the Hallgate Member.
Thickness: Variable, possibly up to 18m.
Geographical Limits: The unit forms a thin 'marker horizon' in the western, southern and eastern parts of the Bradgate Formation, between The Hollies (SK 478 118) and Bradgate Park (SK 5308 1149).
Parent Unit: Bradgate Formation (CMBT)
Previous Name(s): Slate Agglomerate (-798)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Crags in Bradgate Park, just west of the Sliding Stone enclosure. 
Reference(s):
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) 
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. 
Walls, W W, 1947. Geology of the ancient rocks of Charnwood Forest, Leicestershire. Leicester: Leicester Literary and Philosophical Society. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155