The BGS Lexicon of Named Rock Units — Result Details
Barr Limestone Formation
Computer Code: | BLZ | Preferred Map Code: | BL |
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Status Code: | Full | ||
Age range: | Sheinwoodian Age (SS) — Sheinwoodian Age (SS) | ||
Lithological Description: | Grey, micritic limestone interbedded with grey mudstone containing large calcareous nodules. | ||
Definition of Lower Boundary: | Gradational increase in thickness and number of limestone beds from underlying Buildwas Formation. | ||
Definition of Upper Boundary: | Gradational decrease in thickness and number of limestone beds to overlying Coalbrookdale Formation. | ||
Thickness: | 9-10m at Walsall | ||
Geographical Limits: | South Staffordshire. | ||
Parent Unit: | Not Applicable (-) | ||
Previous Name(s): | Barr Limestone
(-707)
Woolhope Limestone [Obsolete Name and Code: Use BLZ] (-1363) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | Walsall Co-operative Society Borehole; 762' to 795'6" (SP09NW/33) | ||
Type Area | Series of overgrown quarries from Cuckoo's Nook to Daisy Bank, Hay Head, Great Barr. | ||
Reference(s): | |||
Bassett, M G. 1974. Review of the stratigraphy of the Wenlock Series of the Welsh Borderlands and South Wales. Palaeontology, 17, 745-777. | |||
Butler, A J. 1937. On Silurian and Cambrian rocks encountered in a deep boring at Walsall, South Staffordshire. Geological Magazine, Vol. 74, 241-257. | |||
Whitehead, T H and Eastwood, T, 1927. The geology of the southern part of the South Staffordshire Coalfield. Memoir of the Geological Survey of Great Britain. | |||
Cocks, L R M, Holland, C H, Rickards, R B and Strachan, I, 1971. A correlation of Silurian rocks in the British Isles. Geological Society of London, Special Report No.1. | |||
Barrow, G, Gibson, W, Cantrill, T C, Dixon, E E L, and Cunningham, C H. 1919. The geology of the country around Lichfield. Memoir of the Geological Survey of Great Britain. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E168 E154 |