The BGS Lexicon of Named Rock Units — Result Details
Lower Ludlow Shales Group
| Computer Code: | LLUS | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Pending Upgrade | ||
| Age range: | Gorstian Age (SG) — Gorstian Age (SG) | ||
| Lithological Description: | 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: | 220m to 240m in Malvern Hills. | ||
| Geographical Limits: | Welsh Borderland. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Lower Ludlow Group [Obsolete Name and Code: Use LLU, LLUS]
(-4165)
Lower Ludlow Siltstone Formation [Obsolete Name and Code: Use LLU, LLUS] (-2292) Lower Ludlow Shales Formation [Obsolete Name And Code: Use LLUS] (LLU) Lower Ludlow Rock [Obsolete Name and Code: Use LLUS, LLU] (-1663) Lower Ludlow Shales [Obsolete Name and Code: Use LLU, LLUS] (-1664) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Area immediately west of Ludlow, Shropshire. | ||
| Reference(s): | |||
| Murchison, R I, 1839. 'Silurian System'. [London: John Murray.] | |||
| 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. | |||
| 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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E181 E154 E167 E198 E199 E216 E232 | |||