The BGS Lexicon of Named Rock Units — Result Details
Brora Shale Member
Computer Code: | BROR | Preferred Map Code: | Bror |
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Status Code: | Full | ||
Age range: | Callovian Age (JC) — Callovian Age (JC) | ||
Lithological Description: | Predominantly bituminous fissile mudstone with minor medium-grained sandstone and silty sand. | ||
Definition of Lower Boundary: | Overlies the Brora Coal Formation, distinguished by an erosional boundary and sharp lithological change. | ||
Definition of Upper Boundary: | Passes upwards into silty sandstones of the Glauconitic Sandstone Member. | ||
Thickness: | c. 30 m. | ||
Geographical Limits: | Brora area, Sutherland, Scotland. | ||
Parent Unit: | Strathsteven Mudstone Formation (SSTV) | ||
Previous Name(s): | Brora Coal, Shales, Shelly Clays and Sandstones, and 'Roof Bed' [Obsolete Name and Code: Use BROR]
(-4500)
Brora Shale Formation (-724) |
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Alternative Name(s): | Brora Argillaceous Series [Obsolete: use BRARG, SSTV] |
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Stratotypes: | |||
Type Section | The type section of the Brora Shale Member is the 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, and Riding, J B. 2014. A revision of the Jurassic (Bathonian to Oxfordian) lithostratigraphy of the onshore Moray Firth Basin, north-east Scotland. Proceedings of the Geologists' Association, Vol. 125, pp. 74-82. | |||
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, 1993. Bathonian to Oxfordian strata of the Brora area. Fig.2 in Excursion guide to the geology of East Sutherland and Caithness. Trewin, N H and Hurst, A (editors). (Edinburgh:Scottish Academic Press). | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S103 S103 |