The BGS Lexicon of Named Rock Units — Result Details
Barr Limestone Formation
| Computer Code: | BLZ | Preferred Map Code: | BL |
|---|---|---|---|
| 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) |
||
| 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): | |||
| 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. | |||
| 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. | |||
| 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. | |||
| Bassett, M G. 1974. Review of the stratigraphy of the Wenlock Series of the Welsh Borderlands and South Wales. Palaeontology, 17, 745-777. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E168 E154 | |||