The BGS Lexicon of Named Rock Units — Result Details
Black Band Ironstone Member
| Computer Code: | BBG | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Bolsovian Substage (CC) — Bolsovian Substage (CC) | ||
| Lithological Description: | Grey mudstone, siltstone and sandstone with 6 named coals, thick seatearths and 4 blackband ironstones. Ironstones pass laterally into limestone or calcareous mudstone to the south. Reddened mudstones increase in number and thickness to the south and west. | ||
| Definition of Lower Boundary: | Base of the Bassey Mine Coal. | ||
| Definition of Upper Boundary: | Passage by alternation from grey strata of the Black Band Ironstone Member to red strata of the Etruria Formation. Top of member taken at top of uppermost grey measures in succession. | ||
| Thickness: | Up to 135 m in the Wolstanton Colliery No. 3 Shaft, SJ84NE/29 (SJ 8606 SJ 4800). | ||
| Geographical Limits: | North Staffordshire Coalfield, but not shown on map. | ||
| Parent Unit: | Pennine Upper Coal Measures Formation (PUCM) | ||
| Previous Name(s): | Black Band Formation [Obsolete Name and Code: Use BBG]
(-3818)
Blackband Group [Obsolete Name and Code: Use BBG] (-2577) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Holts Barn Borehole SJ93NW/2: full thickness from 376.0 m to base of Etruria Formation at 257.56 m depth. (Earp & Calver, 1961) | ||
| Reference(s): | |||
| Earp, J R and Calver, M A. 1961. Exploratory boreholes in the North Staffordshire Coalfield. Bulletin of the Geological Survey of Great Britain, Vol. 17, 153-190. | |||
| Rees, J G and Wilson, A A. 1998. Geology of the country around Stoke-on-Trent. Memoir of the British Geological Survey, Sheet 123 (England and Wales). | |||
| Boardman, E L. 1989. Coal Measures (Namurian and Westphalian) Blackband Iron Formation: fossil bog iron ores. Sedimentology, Vol. 36, 621-633. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E123 | |||