The BGS Lexicon of Named Rock Units — Result Details
Upper Ludlow Shales Formation [Obsolete: use ULUS]
| Computer Code: | ULU | Preferred Map Code: | ULu |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Ludfordian Age (SD) — Ludfordian Age (SD) | ||
| Lithological Description: | [Obsolete: use ULUS] Olive-grey calcareous siltstones, silty mudstones and mudstones. | ||
| Definition of Lower Boundary: | Locally transitional with underlying Aymestry Limestone, locally unconformable on Aymestry Limestone; locally at base of yellow shale overlying Aymestry Limestone. | ||
| Definition of Upper Boundary: | Base of overlying Downton Castle Sandstone. | ||
| Thickness: | 3.5 metres at Gorseley (Worssam and others, 1989). 25 metres - 100 metres in Malverns area. 90 metres in type area. | ||
| Geographical Limits: | Welsh Borderland. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Upper Ludlow Siltstone Formation
(-590)
Upper Ludlow Shales [Obsolete Name and Code: Use ULUS, ULU, WHIT] (-3744) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Area west of Ludlow, Shropshire. | ||
| Reference Section | For Malverns. Excavation at Woodfields Farm (SO 7259 3456) (White and others, 1984). | ||
| Reference(s): | |||
| Alexander, F E S. 1936. The Aymestry Limestone of the Main Outcrop. Quarterly Journal of the Geological Society, Vol. 92, 103-115. | |||
| 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. | |||
| Worssam, B C, Ellison, R A and Moorlock, B S P. 1989. Geology of the country around Tewkesbury. Memoir of the British Geological Survey, Sheet 216 (England and Wales). | |||
| Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E198 E216 E199 E167 | |||