The BGS Lexicon of Named Rock Units — Result Details

Bardon Breccia

Computer Code: BDBR Preferred Map Code: BdB
Status Code: Index Level
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Massive to brecciated, green-grey, locally porphyritic andesite. Grades into hyaloclastic breccia with localised blocks of black-rimmed spherulitic andesite.
Definition of Lower Boundary: Displays a sharp contact with the volcaniclastic sandstone of the Bardon Hill Volcanic Complex.
Definition of Upper Boundary: Not seen, only found in fault contact with the volcaniclastic siltstones and sandstones of the Bradgate Formation.
Thickness: At least 200m thick.
Geographical Limits: Mainly restricted to the western side of Charnwood Forest at Bardon Hill Quarry. May also extend eastwards to Birch Hill.
Parent Unit: Bardon Hill Volcanic Complex (BDHV)
Previous Name(s): (Unnamed) Andesites (-679)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Bardon Hill Quarry, near Coalville. 
Reference(s):
Carney, J N. 1999. Revisiting the Charnian Supergroup: new advances in the understanding of old rocks. Geology Today, Vol. 15, 221-229. 
Carney, J N. 2000, The geology of Bardon Hill and Whitwick quarries in Charnwood Forest, north-west Leicestershire. British Geological Survey Technical Report, WA/00/62. 
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) 
Carney, J N and Pharaoh, T C. 2000. Bardon Hill, 40-43. In: Precambrian Rocks of England and Wales, Geological Conservation Review Series No. 20. (Peterborough: Joint Nature Conservation Committee.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E155