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: Anisian – Norian (Triassic) | |
| Type | Group |
| Underlies | Penarth Group |
| Overlies | Bacton Group |
| Thickness | up to 900m[1] |
| Lithology | |
| Primary | mudstones |
| Other | halite, anhydrite |
| Location | |
| Region | North Sea |
| Country | England |
| Type section | |
| Named for | Haisborough Sands |
| Named by | Rhys, G.H.[2] |
References
edit- ^ 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.
- ^ 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.
- ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=HAI (BGS on-line lexicon of rock units)