| Computer Code: |
CARSH |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Callovian Age (JC)
— Callovian Age (JC) |
| Lithological Description: |
Sparsely fossiliferous bituminous fissile mudstone, with interbedded thin glauconitic siltstone. Includes the 0.5 m-thick bioturbated sandstone of the Brora Roof Bed (BRORO) at the base. |
| Definition of Lower Boundary: |
The lower boundary is a sharp non-sequential change up from the Brora Coal Bed (BRORC) of the Brora Coal Formation (BOCO) to bioturbated medium-grained sandstone of the Brora Roof Bed (BRORO) of the Cadh'-an-Righ Shale Member (MacLennan and Trewin, 1989). |
| Definition of Upper Boundary: |
Overlain by the Shandwick Clay Member (SWKCL). |
| Thickness: |
4.2 m. |
| Geographical Limits: |
Onshore Moray Firth area, north-east Scotland. |
| Parent Unit: |
Balintore Formation (BALR)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Foreshore at Cadh'-an-Righ and Port-an-Righ [NH 849 723 to 853 733] (Cox and Sumbler, 2002, pp. 376-379; Sykes, 1975; Wright and Cox, 2001, pp. 188-190). |
| Reference(s): |
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No. 26. (Peterborough: Joint Nature Conservation Committee.) |
| 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] |
| Wright, J K, and Cox, B M. 2001. British Upper Jurassic Stratigraphy (Oxfordian to Kimmeridgian). Geological Conservation Review Series. No. 21. (Peterborough: Joint Nature Conservation Committee/Chapman and Hall.) |
| 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. |
| 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 |
