The BGS Lexicon of Named Rock Units — Result Details

Rossall Halite Member

Computer Code: RSA Preferred Map Code: notEntered
Status Code: Full
Age range: Anisian Age (TA) — Anisian Age (TA)
Lithological Description: Mudstone, reddish brown, with abundant halite veins and nodules, and common mudstone breccias.
Definition of Lower Boundary: Conformable, at the gradational upward transition from laminated reddish brown and greenish grey mudstones (Sidmouth Mudstone Formation, undifferentiated) to the halite-rich, reddish-brown mudstones of the Rossall Halite Member.
Definition of Upper Boundary: Conformable, at the gradational upward transition from the halite-rich mudstones of the Rossall Halite Member to structureless reddish brown mudstones (Sidmouth Mudstone Formation, undifferentiated).
Thickness: 0 to 12m (Wilson and Evans, 1990)
Geographical Limits: Fylde peninsula, Lancashire, and adjacent parts of the East Irish Sea Basin (Jackson et al., 1997).
Parent Unit: Sidmouth Mudstone Formation (SIM)
Previous Name(s): Rossall Halite Formation (-1147)
Rossall Salts (-1148)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Boreholes in the Rossall area, Fylde peninsula, Lancashire. Wilson and Evans, 1990. 
Reference(s):
Wilson, A A. 1990. The Mercia Mudstone Group (Trias) of the East Irish Sea Basin. Proceedings of the Yorkshire Geological Society, Vol.48, 1-22. 
Howard, A S, Warrington, G, Ambrose, K, and Rees, J G. 2008. A formational framework for the Mercia Mudstone Group (Triassic) of England and Wales. British Geological Survey Research Report, RR/08/04. 
Warrington, G, Audley-Charles, M G, Elliott, R E, Evans, W B, Ivimey-Cook, H C, Kent, P E, Robinson, P L, Shotton, F W and Taylor, F M. 1980. A correlation of the Triassic rocks in the British Isles. Special Report of the Geological Society of London, No.13. 
Wilson, A A and Evans, W B. 1990 Geology of the country around Blackpool. Memoir of the British Geological Survey, Sheet 66. (England and Wales). 
Jackson, D I, Johnson, H and Smith, N J P. 1997. Stratigraphical relationships and a revised lithostratigraphical nomenclature for the Carboniferous, Permian and Triassic rocks of the offshore East Irish Sea Basin. 11-32 in Petroleum Geology of the Irish Sea and Adjacent Areas. Meadows, N S, Trueblood, S P, Hardman, M and Cowan, G. (editors). Geological Society Special Publication, No.124. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable