The BGS Lexicon of Named Rock Units — Result Details
Blair Shale Formation
Computer Code: | BLRS | Preferred Map Code: | BLRS |
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Status Code: | Full | ||
Age range: | Telychian Age (ST) — Telychian Age (ST) | ||
Lithological Description: | Yellowish-brown, thinly bedded shales and sandstones containing three graptolite-bearing horizons. | ||
Definition of Lower Boundary: | Conformable on the Drumyork Flags Formation. | ||
Definition of Upper Boundary: | Conformably overlain by the Knockgardner Sandstone. | ||
Thickness: | 84 m thick. | ||
Geographical Limits: | The Girvan area of south-west Scotland. | ||
Parent Unit: | Dailly Subgroup (DAI) | ||
Previous Name(s): | Blair Shales
(-706)
Blair Flags and Shales [Obsolete Name and Code: Use BLRS] (-1362) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Gully section, 70 m south-south-east of Blair Farm, Girvan Cocks and Toghill, 1973. | ||
Reference(s): | |||
Cameron, I B, Stone, P and Smellie, J, 1986. Geology of the Country around Girvan. Explanation of 1:50 000 sheet. British Geological Survey, Sheet 7, Scotland. | |||
Floyd, J D and Williams, M. 2003. A revised correlation of Silurian rocks in the Girvan district, SW Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 93 (for 2002), 383-92. | |||
Cocks, L R M and Toghill, P, 1973. The biostratigraphy of the Silurian rocks of the Girvan District, Scotland. Journal of the Geological Society of London, Vol. 129, 209-243. | |||
Ingham, J K. 1992. Excursion 30: Girvan Foreshore. 396-416 in Lawson, J D and Weedon, D S (editors), Geological Excursions around Glasgow and Girvan. Geological Society of Glasgow. | |||
Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |