| Computer Code: |
BRHI |
Preferred Map Code: |
BRHI |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
The formation's basal unit is the Swithland Camp Member, composed of purple siltstones and conglomerates. The upper part of the formation is composed of the Stable Pit Member of quartz-arenites and wackes, locally burrowed and cross-bedded. |
| Definition of Lower Boundary: |
Lies unconformably on the late Neoproterozoic Hanging Rocks Formation (formerly the Hanging Rocks Conglomerate Member), latter comprising small-pebble conglomerates fining up to grey/purple volcaniclastic siltstone. |
| Definition of Upper Boundary: |
Conformable gradational passage upwards to grey slaty mudstones of the Swithland Formation, believed to be Lower Cambrian in age (e.g. McIlroy, et al, 1998). |
| Thickness: |
c.35m |
| Geographical Limits: |
Crops out from New Plantation (SK 5010 0902) eastwards to Bradgate Park (SK 5340 0999) and northwards to The Brand (SK 5345 1328). |
| Parent Unit: |
Brand Group (CBA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Stable Pit Member: "Stable Pit"; small quarry in Bradgate Park about 200m south of Bradgate House. Worssam, B C and Old, R A, 1988. |
| Type Section |
Swithland Camp Member: isolated knoll at southeast corner of Swithland Camp. Worssam, B C and Old, R A, 1988. |
| Reference Section |
Stable Pit Member: Brand Hills, c.150m west of "The Brand" House. |
| Reference(s): |
| 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. |
| 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) |
| McIlroy, D, Brasier, M D and Moseley J. 1998. The Proterozoic - Cambrian transition within the 'Charnian Supergroup' of central England and the antiquity of the Ediacara fauna. Journal of the Geological Society of London, Vol. 155, 401 - 413. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E155
|
