The BGS Lexicon of Named Rock Units — Result Details

Merevale Shale Formation

Computer Code: MVSH Preferred Map Code: MvSh
Status Code: Full
Age range: Merioneth Series (EM) — Tremadoc Series (O1)
Lithological Description: Greyish green to dark grey mudstone with pale buff dolomitic bands and lenticles. Becomes darker and more carbonaceous downwards.
Definition of Lower Boundary: Gradational passage down to Monks Park Shale Formation, by increase in content of black carbonaceous mudstone.
Definition of Upper Boundary: Erosional unconformity. Overstepped by younger arenaceous beds.
Thickness: About 90m in general area. About 5.05m true thickness in Merevale No.2 Borehole.
Geographical Limits: Extends from Outwoods north-westwards to just north-east of Woodlands Farm (SP 2978 9620-2849 9870).
Parent Unit: Stockingford Shale Group (SSH)
Previous Name(s): Merevale Shales (-4808)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Quarry 180m northwest of Merevale Church. 
Reference Section  Merevale No.2 Borehole (SP39NW/6), 701ft-720ft 1in. 
Reference(s):
Baldock, J W, 1991. Geology of the Hartshill and Stockingford districts, Nuneaton. British Geological Survey Technical Report, WA/91/60. 
Lapworth, C, Watts, W W and Harrison, W J, 1898. Sketch of the geology of the Birmingham district. Proceedings of the Geologists' Association of London, Vol.15, p.313-389. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E183 E155 E154