The BGS Lexicon of Named Rock Units — Result Details

Esk Evaporite Member

Computer Code: EEV Preferred Map Code: notEntered
Status Code: Full
Age range: Olenekian Age (TO) — Olenekian Age (TO)
Lithological Description: Mudstone, red-brown, with halite beds and veins, and common mudstone breccias formed from halite dissolution.
Definition of Lower Boundary: Conformable, at gradational upward transition from red-brown mudstone to mudstone with halite at the base of the Esk Evaporite Member.
Definition of Upper Boundary: Conformable, at gradational transition from mudstone with halite of the Esk Evaporite Member to red-brown mudstone of the undifferentiated Sidmouth Mudstone Formation.
Thickness: 7m at the type section, ranges up to 50m.
Geographical Limits: Cleveland, northeast England. Proved only in the subsurface, not mapped at outcrop.
Parent Unit: Sidmouth Mudstone Formation (SIM)
Previous Name(s): Esk Evaporite Formation (-4634)
Keuper Halite (-884)
Alternative Name(s): Rot Halite Member
Stratotypes:
Type Section  Staithes No.20 Borehole (NZ71NE/14), Boulby Potash Mine, Cleveland, proves full thickness between 621.2m and 628.5m depth. Curated core held at the National Geosciences Records Centre, BGS Keyworth. Woods, 1973. 
Reference(s):
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. 
Raymond, L R. 1953. Some geological results from the exploration for potash in north-east Yorkshire. Quarterly Journal of the Geological Society of London, Vol. 108, p. 283 - 310. 
Riddler, G P. 1981. The distribution of the Rot Halite Member in North Yorkshire, Cleveland and North Humberside. Proceedings of the Yorkshire Geological Society, Vol.43, 341-346. 
Smith, D B and Pattison, J. 1970. Permian and Triassic. 66-91 in The geology of Durham County. Johnson, G A L and Hickling, G (editors), Transactions of the Natural History Society of Northumbria, Vol.41. 
Woods, P J E. 1973. Potash exploration in Yorkshire: Boulby Mine pilot borehole. Transactions of the Institution of Mining and Metallurgy, Vol.B82, 99-106. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable