The BGS Lexicon of Named Rock Units — Result Details

Rugby 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 [Obsolete Name and Code: Use RLS] (-4865)
Plagiostoma Beds [Obsolete Name and Code: Use RLS] (-4866)
Blue Lias [Obsolete Code: Use BLI] (BLS)
Alternative Name(s): none recorded or not applicable
Type Section  Rugby Portland Cement Company's Parkfield Road Quarry, Rugby (Clements, 1977). 
Reference Section  Long Itchington Quarry (Clements, 1975). 
Reference Section  Harbury Quarry section and borehole (Brewster, 1978; Old et al, 1987). 
Donovan, D T. 1956. The zonal stratigraphy of the Blue Lias around Keynsham, Somerset. Proceedings of the Geologists' Association, Vol.66, p. 182-212. 
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). 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E183 E169 E199 E264