The BGS Lexicon of Named Rock Units — Result Details

Haisborough Group

Computer Code: HAI Preferred Map Code: notEntered
Status Code: Full
Age range: Anisian Age (TA) — Norian Age (TN)
Lithological Description: Mudstone, reddish brown and grey, dolomitic, with thick units of bedded halite and common anhydrite.
Definition of Lower Boundary: Slightly unconformable, at abrupt upward change from sandstone of the Bacton Group to red-brown dolomitic mudstone with evaporites of the overlying Haisborough Group.
Definition of Upper Boundary: Conformable, at an abrupt upward change from red-brown and grey-green mudstones of the Haisborough Group to the dark grey mudstones and grey fine-grained sandstone of the overlying Penarth Group.
Thickness: To 900m (Johnson et al., 1994).
Geographical Limits: Offshore UK, southern North Sea. Equivalent to, and in continuity with, the Mercia Mudstone Group of onshore north-east England (Johnson et al., 1994).
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Conoco Group well 49/21-2, central part of the Southern North Sea Basin, at 53 degrees 19' 00" N, 02 degrees 05' 45" E, between 1375.5 m and 2011.0 m depth. Rhys, 1974, modified by Johnson et al., 1994. 
Reference(s):
Johnson, H, Warrington, G and Stoker, S J. 1994. Permian and Triassic of the Southern North Sea. In Knox, R W O'B and Cordey, W G (editors), Lithostratigraphic nomenclature of the UK North Sea. [Nottingham: British Geological Survey.] 
Rhys, G H. 1974. A proposed standard lithostratigraphic nomenclature for the southern North Sea and an outline structural nomenclature for the whole of the (UK) North Sea. Report of the Institute of Geological Sciences, 74/8. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E162 E132 E148