| Computer Code: |
BROSH |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Callovian Age (JC)
— Callovian Age (JC) |
| Lithological Description: |
About 2.3 m of silty sand grading up into about 25 m of bituminous fissile mudstone with thin interbedded glauconitic sandstone beds (Arkell, 1933; Sykes, 1975). |
| Definition of Lower Boundary: |
Overlies the Brora Roof Bed (BRORO). |
| Definition of Upper Boundary: |
Overlain by the Glauconitic Sandstone Member (GLCSA). |
| Thickness: |
27.3 m. |
| Geographical Limits: |
Brora area, Sutherland, Scotland. |
| Parent Unit: |
Brora Shale Member (BROR)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Foreshore [NC 904 031] south of the River Brora estuary, to the east of Inverbrora Farm [NC 893 034]. |
| Reference(s): |
| Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. |
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) |
| Sykes, R M. 1975. The stratigraphy of the Callovian and Oxfordian stages (Middle-Upper Jurassic) in northern Scotland. Scottish Journal of Geology, Vol.11, 51-78. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
