The BGS Lexicon of Named Rock Units — Result Details

Humber Group

Computer Code: HMBG Preferred Map Code: notEntered
Status Code: Full, pending ratification
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):
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. 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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable