Cromer Knoll Group

The Cromer Knoll Group is a geological group of Early Cretaceous age, found at outcrop in eastern England and developed extensively beneath the North Sea in the UK, Norwegian and Danish sectors and in the Norwegian Sea.^[1][2][3][4] It preserves fossils dating back to the Early Cretaceous period.

Cromer Knoll Group
Stratigraphic range: Lower Cretaceous
Type	Group
Sub-units	Speeton Clay, Hunstanton Formation, Spilsby Sandstone (onshore UK); Valhall Formation, Carrack Formation, Rødby Formation (UK Central and Northern North Sea); Valhall Formation, Carrack Formation, Red Chalk (UK Southern North Sea); Åsgard Formation, Tuxen Formation, Mime Formation, Sola Formation, Rødby Formation, Agat Formation (Norwegian North Sea); Lyr Formation, Lange Formation, Lysing Formation (Norwegian Sea); Valhall Formation, Tuxen Formation, Sola Formation, Rødby Formation (Danish Central Graben)
Underlies	Chalk Group (onshore UK and UK North Sea); Shetland Group (UK North Sea, Norwegian North Sea, Norwegian Sea)
Overlies	Ancholme Group[citation needed] (onshore UK), Kimmeridge Clay Formation (UK North Sea), Draupne Formation, Mandal Formation, Flekkefjord Formation (Norwegian North Sea), Farsund Formation (Danish Central Graben)
Thickness	>700 m (6506/12-4 well); >1370 m (210/15b-4 well)
Lithology
Primary	Mudstone, calcareous mudstone
Other	Limestone, siltstone, sandstone
Location
Region	England, North Sea, Norwegian Sea
Country	United Kingdom, Norway, Denmark
Extent	North Sea, Norwegian Sea
Type section
Named for	Cromer Knoll buoy
Named by	Rhys (1974)

See also

• Earth sciences portal
• England portal
• Paleontology portal

• List of fossiliferous stratigraphic units in England

References

1. H Johnson; A B Leslie; C K Wilson; I J Andrews; R M Cooper. "Middle Jurassic, Upper Jurassic and Lower Cretaceous of the UK Central and Northern North Sea" (PDF). Research Report RR/03/001. British Geological Survey. Retrieved 27 July 2014.
2. Norwegian Petroleum Directorate. "Cromer Knoll Gp". FactPages: Norwegian Petroleum Directorate. Retrieved 17 December 2022.
3. Van Buchem, F.S.P.; Smit, F.W.H.; Buijs, G.J.A.; Trudgill, B.; Larsen, P.-H. (2018). "Tectonostratigraphic framework and depositional history of the Cretaceous–Danian succession of the Danish Central Graben (North Sea) – new light on a mature area". In Bowman, M.; Levell, B. (eds.). Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference. Geological Society, London. doi:10.1144/PGC8.24. ISBN 978-1-78620-277-2.
4. Patruno, S.; Kombrink, H.; Archer, S.G. (2021). "Cross-border stratigraphy of the Northern, Central and Southern North Sea: a comparative tectono-stratigraphic megasequence synthesis". In Patruno, S.; Archer, S.G.; Chiarella, D.; Howell, J.A.; Jackson, C.A.-L.; Kombrink, H. (eds.). Cross-border stratigraphy of the Northern, Central and Southern North Sea: a comparative tectono-stratigraphic megasequence synthesis. Special Publications. Vol. 494. Geological Society. doi:10.1144/SP494-2020-228. ISBN 978-1-78620-457-8.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.