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)
Alternative Name(s): none recorded or not applicable
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). 
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. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E085 E084 E075 E098 E109 E097 E059