The BGS Lexicon of Named Rock Units — Result Details

Collyhurst Sandstone Formation

Computer Code: CS Preferred Map Code: CS
Status Code: Full
Age range: Cisuralian Epoch (PLC) — Cisuralian Epoch (PLC)
Lithological Description: A soft red sandstone with abundant beds of "millet seed" sand grains alternating with beds of fine-grained sharp sand (Tonks, and others, 1931); some interbedded grey sandstones locally.
Definition of Lower Boundary: Lower boundary is a major plane of unconformity, generally on reddened Carboniferous Coal Measures strata.
Definition of Upper Boundary: Taken at the point where red mudstone and siltstone, characteristic of the overlying Manchester Marls, become predominant over sandstone.
Thickness: Ranges from 0 - 262m in type area and 0 - 715m around Formby (Falcon and Kent, 1960).
Geographical Limits: Lancashire and Cheshire.
Parent Unit: Appleby Group (APY)
Previous Name(s): Permian Sandstone (-3964)
Lower Permian Sandstone (-748)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North and east Manchester. Collyhurst is about 3km north east of Manchester City Centre. (Hull, 1864, fig.9, p.38-39 described a former section at Collyhurst, the precise location of which is now uncertain). 
Reference Section  Measured section recorded in Rochdale Road sewer tunnel (Tonks and others, 1931, fig. 40). 
Reference(s):
Tonks, L H, Jones, R C B, Lloyd, W and Sherlock, R L, 1931. The geology of Manchester and the south-east Lancashire Coalfield. Memoir of the Geological Survey of England and Wales. 
Poole, E G and Whiteman, A J. 1955. Variations in the thickness of the Collyhurst Sandstone in the Manchester area. Bulletin of the Geological Survey of Great Britain, No.9, p.33-41. 
Hickling, G, 1918. The geology of Manchester as revealed by borings. Transactions of the Institution of Mining Engineers, Vol.LIV, p.367-417. 
Hull, E, 1864. The geology of the country around Oldham, including Manchester and its suburbs. Memoir of the Geological Survey of Great Britain, Sheet 88SW. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E085 E084 E075 E098 E109 E097 E059