| Computer Code: |
PARSI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Callovian Age (JC)
— Oxfordian Age (JO) |
| Lithological Description: |
Largely consists of relatively sparsely fossiliferous bituminous coarse silt. This unit comprises thin (0.1 to 1.8 m) rhythmic units that coarsen upwards from carbonaceous shale or silt, to fine-grained muddy sandstone. The uppermost bed is 5.7 m of fine-grained muddy sandstone. There is strong evidence that there are fine-grained beds above the Port-an-Righ Siltstone Member that are not exposed onshore (Sykes, 1975, p. 62). |
| Definition of Lower Boundary: |
Overlies the Port-an-Righ Ironstone Member (PARIR). |
| Definition of Upper Boundary: |
The Port-an-Righ Siltstone Member is the youngest unit of the Balintore Formation (BALR) seen, and the uppermost beds dip off into deep water at low tide. |
| Thickness: |
21.7 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): |
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) |
| Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No. 26. (Peterborough: Joint Nature Conservation Committee.) |
| 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 |
