| 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 P. 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
|
