The BGS Lexicon of Named Rock Units — Result Details

Outwoods Shale Formation

Computer Code: OWSH Preferred Map Code: OwSh
Status Code: Full
Age range: Merioneth Series (EM) — Merioneth Series (EM)
Lithological Description: Interbedded grey burrowed, and dark-grey or greenish grey pyritic, mudstone. Beds of siltstone and sandstone increase in upper part.
Definition of Lower Boundary: Transitional passage, with decreasing proportion of bioturbated, erosionally-truncated beds in upper part.
Definition of Upper Boundary: Transitional passage into the Moor Wood Sandstone Formation by increase in silty and sandy beds and decrease in dark-grey, pyritic and carbonaceous material.
Thickness: 300m in general: 87m minimum in Merevale No.1 borehole; 158m minimum in Merevale No.3 borehole.
Geographical Limits: Extends from eastern suburbs of Bedworth, northwest to just east of Merevale Hall. (SP 3688 8633-2986 9758)
Parent Unit: Stockingford Shale Group (SSH)
Previous Name(s): Outwoods Shales (-2356)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  At Oldbury Quarry, 500m northwest of Oldbury. 
Reference Section  (Including lower boundary) Merevale No.3 Borehole (SP39NW/7) 0-518ft 3ins. 
Reference Section  (Including upper boundary) Merevale No.1 Borehole (SP29NE/16) 427'5" to 714"0" (base not penetrated) 
Reference(s):
Illing, V C, 1913. Recent discoveries in the Stockingford Shales near Nuneaton. Geological Magazine, Vol.10/5, p.452-453. 
Baldock, J W, 1991. Geology of the Hartshill and Stockingford districts, Nuneaton. British Geological Survey Technical Report, WA/91/60. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E169 E155