| Cromer Knoll Group | |
| Type: | Group |
| Age: | Lower Cretaceous |
| Period: | Cretaceous |
| Prilithology: | Mudstone, calcareous mudstone |
| Otherlithology: | Limestone, siltstone, sandstone |
| Namedfor: | Cromer Knoll buoy |
| Namedby: | Rhys (1974) |
| Region: | England, North Sea, Norwegian Sea |
| Country: | United Kingdom, Norway, Denmark |
| Subunits: | 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 (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) |
| Extent: | North Sea, Norwegian Sea |
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.