The BGS Lexicon of Named Rock Units — Result Details

Rugby Limestone Member

Computer Code: RLS Preferred Map Code: RLs
Status Code: Full
Age range: Hettangian Age (JH) — Sinemurian Age (JS)
Lithological Description: Alternating grey, argillaceous limestones and mudstones.
Definition of Lower Boundary: Conformable on Saltford Shale Member - placed at base of an argillaceous limestone above which such limestones are common; at type section boundary placed at limestone below Bed 8 of Clements (1977).
Definition of Upper Boundary: Placed at top of highest limestone of the limestone/mudstone sequence. At the type section, placed at Bed 53c of Clements (1977).
Thickness: 36m at type section; up to 40m elsewhere.
Geographical Limits: Central and southern Midlands.
Parent Unit: Blue Lias Formation (BLI)
Previous Name(s): Lima Beds (-4865)
Plagiostoma Beds (-4866)
Blue Lias [Obsolete Code: Use BLI] (BLS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Long Itchington Quarry (Clements, 1975). 
Reference Section  Harbury Quarry section and borehole (Brewster, 1978; Old et al, 1987). 
Type Section  Rugby Portland Cement Company's Parkfield Road Quarry, Rugby (Clements, 1977). 
Reference(s):
Old R A, Hamblin, R J O, Ambrose, K, and Warrington G. 1991. Geology of the country around Redditch. Memoir of the British Geological Survey, Sheet 183 (England and Wales). 
Brewster, J, 1978. Harbury Quarry Borehole. Report of the Institute of Geological Sciences, No. 77/10. 
Clements, R G, (Editor) 1975. Report on the geology of Long Itchington Quarry, Leicester. Department of Geology, Leicester University. 
Clements, R G, (Editor) 1977. Report on the geology of Parkfield Road Quarry, Rugby. Department of Geology, Leicester University, p.54. 
Old, R A, Sumbler, M G and Ambrose, K, 1987. Geology of the country around Warwick. Memoir of the British Geological Survey, Sheet 184 (England and Wales). 
Donovan, D T, 1956. The zonal stratigraphy of the Blue Lias around Keynsham, Somerset. Proceedings of the Geologists' Association, Vol.66, p. 182-212. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E264 E183 E169 E199