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 Shales Formation [Obsolete Name And Code: Use LLUS] (LLU)
Lower Ludlow Group (-4165)
Lower Ludlow Siltstone Formation (-2292)
Lower Ludlow Rock (-1663)
Lower Ludlow Shales (-1664)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Area immediately west of Ludlow, Shropshire. 
Reference(s):
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E181 E154 E167 E198 E199 E216 E232