The BGS Lexicon of Named Rock Units — Result Details

Beacon Hill Formation

Stratotypes:
Computer Code:	CMBH	Preferred Map Code:	BHI
Status Code:	Full
Age range:	Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description:	Varied sequence of grey to blue-grey epiclastic and tuffaceous mudstones, siltstones and sandstones with subordinate volcanic block-breccias and lithic-crystal tuffs.
Definition of Lower Boundary:	Probable sharp contact, at base of Benscliffe Breccia Member, on grey-green, laminated, fine- to medium-grained volcaniclastic beds of the Blackbrook Reservoir Formation.
Definition of Upper Boundary:	Sharply overlain by Bradgate Formation beds, of blue-grey, laminated volcaniclastic mudstones, siltstones and sandstones.
Thickness:	About 1840m
Geographical Limits:	Extends from Nanpantan Hills, south to Bradgate Park, then north-west to Ulverscroft Mill.
Parent Unit:	Maplewell Group (CMV)
Previous Name(s):	Beacon Hill Tuff Formation [Obsolete Name and Code: Use BHF, CMBH] (-3212) Beacon Hill Formation (CMBH)
Alternative Name(s):	none recorded or not applicable
Type Area	From Nanpantan Hills south to Bradgate Park.
Reference(s):
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)
Watts, W W, 1947. Geology of the ancient rocks of Charnwood Forest, Leicestershire. Leicester: Leicester Literary and Philosophical Society.
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.
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155 E141

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