| Computer Code: |
INVBR |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Callovian Age (JC) |
| Lithological Description: |
Grey and black, laminated, bituminous fissile mudstones, some of which approach oil shale composition. Two coals are developed in this succession, including a thin coal developed about 8 m below the top of the formation and a prominent seam, 1 m thick, forming the uppermost bed and termed the Brora Coal (Bed) (BRORC). |
| Definition of Lower Boundary: |
Overlies Bed 1 of the Doll Member (DOLL). |
| Definition of Upper Boundary: |
Overlain by the prominent 1 m thick seam termed the Brora Coal (Bed) (BRORC). |
| Thickness: |
About 15 m. |
| Geographical Limits: |
Brora area, Sutherland, Scotland. |
| Parent Unit: |
Brora Coal Formation (BOCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Foreshore south of the River Brora estuary, Sutherland [NC 900 030], between the Brora Fault and the railway, and the sea. |
| Reference(s): |
| Hudson, J D. 1962. The Great Estuarine Series (Middle Jurassic) of the Inner Hebrides. Unpublished PhD thesis, University of Cambridge, Cambridge, UK, 350pp. |
| Maclennan, A M and Trewin, N H. 1989. Palaeoenvironments of the late Bathonian- mid Callovian in the Inner Moray Firth. In: Keen, M C and Batten, D J (eds.) Northwestern European micropalaeontology and palynology, 92-117. [Ellis Horwood, Chichester] |
| Riding, J B. 2005. Middle and Upper Jurassic (Callovian to Kimmeridgian) palynology of the onshore Moray Firth Basin, northeast Scotland. Palynology, Vol. 29, 87-142. |
| 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. |
| Hurst, A R. 1981. Mid Jurassic stratigraphy and facies at Brora, Sutherland. Scottish Journal of Geology, Vol. 17, p. 169 - 177. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
