Haisborough Group Explained

Haisborough Group
Type:	Group
Age:	Anisian – Norian (Triassic)
Prilithology:	mudstones
Otherlithology:	halite, anhydrite
Namedfor:	Haisborough Sands
Namedby:	Rhys, G.H.^[1]
Region:	North Sea
Country:	England
Underlies:	Penarth Group
Overlies:	Bacton Group
Thickness:	up to 900m^[2]

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]

Notes and References

1. 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.
2. 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.
3. http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HAI (BGS on-line lexicon of rock units)