The BGS Lexicon of Named Rock Units — Result Details

Lower Ludlow Shales Formation [Obsolete Name And Code: Use LLUS]

Computer Code: LLU Preferred Map Code: LLu
Status Code: Index Level
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: 220 metres - 240 metres in Malverns.
Geographical Limits: Welsh Borderland.
Parent Unit: Lower Ludlow Shales Group (LLUS)
Previous Name(s): Lower Ludlow Siltstone Formation (-2292)
Lower Ludlow Rock (-1663)
Lower Ludlow Shales (-1664)
Lower Ludlow Group (-4165)
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.] 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E216 E198 E232 E199 E154 E167