The BGS Lexicon of Named Rock Units — Result Details
Lower Ludlow Shales Formation [Obsolete: use LLUS]
| Computer Code: | LLU | Preferred Map Code: | LLu |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Gorstian Age (SG) — Gorstian Age (SG) | ||
| Lithological Description: | [Obsolete: use LLUS] Silty mudstones and siltstones. | ||
| Definition of Lower Boundary: | Transitional with Much Wenlock Limestone (not formally defined). | ||
| Definition of Upper Boundary: | Transitional with Aymestry Limestone (not formally defined). | ||
| Thickness: | 220 metres - 240 metres in Malverns. | ||
| Geographical Limits: | Welsh Borderland. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Lower Ludlow Siltstone Formation [Obsolete Name and Code: Use LLU, LLUS]
(-2292)
Lower Ludlow Rock [Obsolete Name and Code: Use LLUS, LLU] (-1663) Lower Ludlow Shales [Obsolete Name and Code: Use LLU, LLUS] (-1664) Lower Ludlow Group [Obsolete Name and Code: Use LLU, LLUS] (-4165) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Area immediately west of Ludlow, Shropshire. | ||
| Reference(s): | |||
| Phipps, C B, and Reeve, F A E. 1969. Structural geology of the Malvern, Abberley and Ledbury Hills. Quarterly Journal of the Geological Society of London, Vol. 125, 1-37. | |||
| Phillips, J. 1848. The Malvern Hills compared with the Palaeozoic districts of Abberley, Woolhope, May Hill, Tortworth and Usk. Memoir of the Geological Survey of Great Britain, Vol. 2, Part 1. | |||
| Murchison, R I, 1839. 'Silurian System'. [London: John Murray.] | |||
| Groom, T T, 1900. On the geological structure of portions of the Malvern and Abberley Hills. Quarterly Journal of the Geological Society of London, Vol.56, 129-169. | |||
| White, D E, Ellison, R A and Moorlock, B S P, 1984. New information on the stratigraphy of the Upper Silurian rocks in the southern part of the Malverns district, Hereford and Worcester. British Geological Survey Short Communications. Report of the British Geological Survey, Vol.16, No.1, p.13-18. | |||
| Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E216 E198 E232 E199 E154 E167 | |||