The BGS Lexicon of Named Rock Units — Result Details

North Charnwood Diorite

Computer Code: NCHD Preferred Map Code: SYMB
Status Code: Full
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Coarse-grained inequigranular diorite, comprising a dark grey matrix with c.40-50% of white, subhedral plagioclase crystals. Fine-grained and equigranular at chilled margin.
Definition of Lower Boundary: Margins generally cut Charnian bedding at high angles and show chilling within c.5-10m of contact.
Definition of Upper Boundary: None.
Thickness: c.60m, sheet like bodies.
Geographical Limits: Locally exposed northwards from Ulverscroft to the southern outskirts of Shepshed.
Parent Unit: Not Applicable (-)
Previous Name(s): North Charnwood Diorites (-2954)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Longcliffe Quarry. 
Reference Section  Five Tree Plantation. 
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) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155 E141