Computer Code: |
CRKN |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Berriasian Age (KR)
— Albian Age (KA) |
Lithological Description: |
Sandstones, mudstones, siltstones and limestones of the Valhall Formation, Rødby Formation, Carrack Formation, Britannia Sandstone Formation and Wick Formation. Originally erected by Rhys (1974), emended by Deegan and Scull (1977) and further revised by Johnson and Lott (1993). |
Definition of Lower Boundary: |
A downward change from the Valhall and Wick Sandstone formations in the lower part of Cromer Knoll Group to the mainly argillaceous Kimmeridge Clay Formation of the Humber Group. |
Definition of Upper Boundary: |
Downward change from the chalks of the Chalk Group and the calcareous and chalky mudstones, of the Svarte Formation of the Shetland Group, to the Rødby Formation at the top of the Cromer Knoll Group. |
Thickness: |
none recorded or not applicable
|
Geographical Limits: |
Southern and Northern North Sea. |
Parent Unit: |
Not Applicable (-)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Johnson, H and Lott, G K. 1993. 2. Cretaceous of the Central and Northern North Sea. In Knox, R W O'B and Cordey, W G (eds.) Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. |
Deegan, C E and Scull, B J. 1977. A standard lithostratigraphic nomenclature for the Central and Northern North Sea. Report of the Institute of Geological Sciences, 77/25; NPD Bulletin No.1. |
Rhys, G H. 1974. A proposed standard lithostratigraphic nomenclature for the southern North Sea and an outline structural nomenclature for the whole of the (UK) North Sea. Report of the Institute of Geological Sciences, 74/8. |
Lott, G K and Knox, R W O'B. 1994. 7. Post-Triassic of the Southern North Sea. In: Knox, R W O'B and Cordey, W G (eds.) Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. |
Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |