The BGS Lexicon of Named Rock Units — Result Details
Meriden Formation [Obsolete: use SAL]
| Computer Code: | MRD | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Asturian Substage (CAS) — Stephanian Stage (CS) | ||
| Lithological Description: | [Obsolete: use SAL] Redbed sequence consisting of interbedded mudstones, sandstones and subordinate thin conglomerates with a few thin beds of Spirorbis limestone; subdivision of sequence into members based on recognition of upwards-coarsening cycles. | ||
| Definition of Lower Boundary: | Transitional boundary defined in the field at the upwards change from grey measures of the Halesowen Formation to redbeds. Defined on geophysical logs (in uncored boreholes) above a narrow zone of high gamma radiation. | ||
| Definition of Upper Boundary: | Top taken at the highest mappable persistent sandstone beneath the predominantly argillaceous sequence of the overlying Tile Hill Mudstone Formation. | ||
| Thickness: | c.730m | ||
| Geographical Limits: | Warwickshire Coalfield (northern part, Sheet 169). Likely to extend in the subcrop across the southern part of the Warwickshire Coalfield (Sheet 184). | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Keele Formation [Obsolete Name And Code: Use ALY]
(KE)
Coventry Sandstone Formation [Obsolete Name And Code: See ASY] (CYS) |
||
| Alternative Name(s): | Salop Formation |
||
| Stratotypes: | |||
| Type Area | Warwickshire Coalfield; outcrop to the north and east of Meriden, although exposures poor. | ||
| Reference Section | Birch Tree Farm Borehole, SP38SW/161. Lower part of formation cored from 300 m. to base at 519.5m below surface. | ||
| Reference Section | Rough Close Borehole, SP27NE/9. Uncored borehole but full suite of geophysical logs through complete formation. Top defined at 109m, base at c.718m below surface. | ||
| Reference(s): | |||
| Old, R A, Sumbler, M G and Ambrose, K, 1987. Geology of the country around Warwick. Memoir of the British Geological Survey, Sheet 184 (England and Wales). | |||
| Bridge, D M, Carney, J N, Lawley, R S, and Rushton, A W A. 1998. Geology of the country around Coventry and Nuneaton. Memoir of the British Geological Survey, Sheet 169 (England and Wales). | |||
| Powell, J H, Chisholm, JI, Bridge, D M, Rees, J G, Glover, B W and Besly, B M. 2000. Stratigraphical framework for Westphalian to Early Permian red-bed successions of the Pennine Basin. British Geological Survey Technical Report WA/99/10. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||