The Bacton Group is a Triassic lithostratigraphic group (a sequence of rock strata) beneath the southern part of the North Sea. The name is derived from Bacton on the Norfolk coast. These strata, which are up to 600 m thick are the offshore equivalent of the Roxby Formation and Sherwood Sandstone Group which occur in northeast England. The group comprises a lower Bunter Shale Formation of red and brown to grey mudstones and an upper Bunter Sandstone Formation of dolomitic sandstones with mudstone interlayers.[3]
| Bacton Group | |
|---|---|
| Stratigraphic range: Early Triassic epoch | |
| Type | Group |
| Sub-units | Bunter Shale Formation, Bunter Sandstone Formation |
| Underlies | Haisborough Group |
| Overlies | Zechstein Group |
| Thickness | up to 600m[1] |
| Lithology | |
| Primary | mudstones |
| Other | dolomitic sandstone |
| Location | |
| Region | North Sea |
| Country | England |
| Type section | |
| Named for | Bacton |
| Named by | Rhys, G.H.[2] |
References
edit- ^ 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 (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=BACT (BGS on-line lexicon of rock units)