Jump to content

User:Mikenorton/Sandbox3

From Wikipedia, the free encyclopedia
Cromer Knoll Group
Stratigraphic range: Lower Cretaceous
TypeGroup
Sub-unitsSpeeton Clay, Hunstanton Formation, Spilsby Sandstone (onshore UK); Valhall Formation, Carrack Formation, Rødby Formation (UK Central and Norther 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)
UnderliesChalk Group (onshore UK and UK North Sea); Shetland Group (UK North Sea, Norwegian North Sea, Norwegian Sea)
OverliesAncholme 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
PrimaryMudstone, calcareous mudstone
OtherLimestone, siltstone, sandstone
Location
RegionEngland, North Sea, Norwegian Sea
CountryUnited Kingdom, Norway, Denmark
ExtentNorth Sea, Norwegian Sea
Type section
Named forCromer Knoll buoy
Named byRhys (1974)

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.

Distribution

[edit]

The Cromer Knoll Group is recognised locally onshore Eastern England and over a wide area of the North Sea and Norwegian sea. In the Southern North Sea it is found throughout the UK sector and the Danish Central Graben.[4] In the Netherlands sector the equivalent unit is the Rijnland Group.[5]

See also

[edit]

References

[edit]
  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. ^ a b 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.
  5. ^ van Dalfsen, W.; Doornenbal, J.C.; Dortland, S.; Gunnink, J.L. "A comprehensive seismic velocity model for the Netherlands based on lithostratigraphic layers". Netherlands Journal of Geosciences. 85 (4): 277–292. doi:10.1017/S0016774600023076.