The Haisborough Group is a Triassic lithostratigraphic group (a sequence of rock strata) beneath the southern part of the North Sea . The name is derived from the Haisborough Sands off the coast of Norfolk. The Group is up to 900m thick and comprises red, brown and grey mudstones with beds of halite and anhydrite. It is the offshore equivalent of the Mercia Mudstone Group as recorded in the northeast of England.[3]

Haisborough Group
Stratigraphic range: AnisianNorian (Triassic)
TypeGroup
UnderliesPenarth Group
OverliesBacton Group
Thicknessup to 900m[1]
Lithology
Primarymudstones
Otherhalite, anhydrite
Location
RegionNorth Sea
CountryEngland
Type section
Named forHaisborough Sands
Named byRhys, G.H.[2]

References

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  1. ^ Johnson, H., Warrington, G. & Stoker, S. J. 1994. ‘’Permian and Triassic of the Southern North Sea’’. In Knox, R. W. O'B. and Cordey, W. G. (eds), ‘’Lithostratigraphic nomenclature of the UK North Sea’’. Nottingham: British Geological Survey.
  2. ^ 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’’. Institute of Geological Sciences, Report No.74/8.
  3. ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HAI (BGS on-line lexicon of rock units)