The BGS Lexicon of Named Rock Units — Result Details

Edale Shale Group [Obsolete Name And Code: Use BSG]

Computer Code: ESH Preferred Map Code: ESH
Status Code: Index Level
Age range: Namurian Stage (CN) — Namurian Stage (CN)
Lithological Description: Dark grey and grey mudstones with subordinate bands of limestone, ironstone, siliceous sandstone and siltstone, and calcareous siltstone.
Definition of Lower Boundary: Incoming of Cravenoceras leion, or where limestone bands decrease markedly upwards in a mudstone sequence.
Definition of Upper Boundary: Base of lowest significant feldspathic sandstone (Mam Tor Sandstones in type area).
Thickness: Varies greatly, 0 at basin margin, 240m in type area, 370m in Alport Borehole.
Geographical Limits: Central and south Pennines; Peak District; North Staffordshire Basin, Widmerpool Gulf.
Parent Unit: Not Entered (?)
Previous Name(s): Edale Shales (-1397)
Alternative Name(s): Bowland Shale Formation
Stratotypes:
Reference Section  For most of group including base: Duffield Borehole: 0.86 to 405.78m depth:E1a to H1a mudstone resting conformably on Widmerpool Formation: Aitkenhead, 1977. 
Reference Section  For full group: Tansley Borehole from 462ft 7ins (140.99m)(base of Ashover Grit) to 962ft 8.5ins (293.43m)(base of Cravenoceras leion Band). Ramsbottom et al, 1962. 
Reference Section  Edale Borehole: borehole, 0-325ft (99.06m) depth: covers base to E1b 
Reference Section  Alport borehole: borehole 20ft to 1099ft (6.09-334.97m): covers base to H2 
Type Area  Edale, Derbyshire: stream sections detailed on 1:25,000 geological sheet SK18 (Castleton) and in Stevenson and Gaunt, 1971. 
Reference Section  For most of group including top: Blake Brook, discontinuous stream section (see Aitkenhead et al, 1985, fig 28; measured sections: SK06SE/14,15,16,17). 
Reference(s):
Jackson, J W, 1927. The succession below the Kinderscout Grit in north Derbyshire. Journal of the Manchester Geological Society, Vol.1/1, p.15-33 
Hudson, R G S and Cotton, G, 1946. The Carboniferous rocks of the Edale Anticline, Derbyshire. Quarterly Journal of the Geological Society of London, Vol.101, p.1-34. 
Stevenson, I P and Gaunt, G D, 1971. Geology of the country around Chapel-en-le-Frith. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 99. 
Ramsbottom, W H C, Rhys, G H and Smith, E G, 1962. Boreholes in the Carboniferous Rocks of the Ashover district, Derbyshire. Bulletin of the Geological Survey of Great Britian, No.19, p.75-142. 
Aitkenhead, N, Chisholm, J I and Stevenson, I P. 1985. Geology of the country around Buxton, Leek and Bakewell. Memoir of the British Geological Survey, England and Wales Sheet 111. 
Aitkenhead, N. 1977. The Institute of Geological Sciences borehole at Duffield, Derbyshire. Bulletin of the Geological Survey of Great Britain, No.59, 1-38. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E123 E142 E141