Cromer_Knoll_Group
Cromer Knoll Group
Geological 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.
Quick Facts Type, Sub-units ...
| 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) |
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- 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.
- Norwegian Petroleum Directorate. "Cromer Knoll Gp". FactPages: Norwegian Petroleum Directorate. Retrieved 17 December 2022.
- 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.
- 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.
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