|Cromer Knoll Group|
Stratigraphic range: Cretaceous
|Sub-units||Speeton Clay, Hunstanton Formation|
- 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.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
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