| Computer Code: |
HMBG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Callovian Age (JC)
— Berriasian Age (KR) |
| Lithological Description: |
Predominantly mudstone and sandstone of the constituent formations:
Brae Formation;
Corallian Formation (Offshore);
Emerald Formation;
Fulmar Formation;
Heather Formation;
Kimmeridge Clay Formation (Offshore);
Piper Formation;
Seeley Formation;
Woodward Formation. |
| Definition of Lower Boundary: |
The base of the group is defined by the base of the Heather Formation in the Northern and Central North Sea and the base of the Seeley Formation in the Southern North Sea. |
| Definition of Upper Boundary: |
The upper boundary of the group is defined by the upper boundary of the Kimmeridge Clay Formation throughout the North Sea. |
| Thickness: |
Up to a maximum of- Southern North Sea: 300 m; Moray Firth: over 2500 m; Northern North Sea: 3000 m. |
| Geographical Limits: |
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): |
| 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. |
| Richards, P C, Lott, G K, Johnson, H, Knox, R W O'B. and Riding, J B. 1993. 3. Jurassic 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. |
| 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 |
