The BGS Lexicon of Named Rock Units — Result Details

Great Britain Superficial Deposits Supergroup

Computer Code: GBG Preferred Map Code: GBG
Status Code: Full
Age range: Paleogene Period (G) — Quaternary Period (Q)
Lithological Description: The Great Britain Superficial Deposits Supergroup is established for all natural superficial deposits including till (diamicton), sand, gravel, silt, clay and peat. Seven groups are defined: Crag Group: marine deposits, Pliocene - Pleistocene; Dunwich Group: mainly fluvial deposits of the ancestral Thames and Bytham rivers, early to mid-Pleistocene; Residual Deposits Group: including the Clay-with-flints, Paleocene - Pleistocene; British Coastal Deposits Group: coastal and marine deposits, Pliocene - Holocene, excluding formations of the Crag Group; Britannia Catchments Group: fluvial, organic and mass movement deposits, mid-Pleistocene - Holocene; Albion Glacigenic Group: glacigenic deposits, mid-Pleistocene (pre-Ipswichian); Caledonia Glacigenic Group: glacigenic deposits, Late Pleistocene (Devensian). Exceptionally, a formation may stand outside a group. A wide range of landforms from those associated with glacigenic processes to fluvial and marine terraces and planated surfaces. Palaeogene-Neogene (Tertiary) to Quaternary.
Definition of Lower Boundary: Generally sharp, unconformable contact with variably weathered bedrock of Neogene (Tertiary) age and older.
Definition of Upper Boundary: The ground surface.
Thickness: Up to 200 m in onshore Britain.
Geographical Limits: Great Britain (England, Scotland and Wales) and the Isle of Man together with adjacent offshore areas.
Parent Unit: Not Applicable (-)
Previous Name(s): Drift deposits [Obsolete Name and Code: Use GBG] (-3416)
Great Britain Glacigenic Supergroup [Obsolete Name and Code: Use GBG] (-1554)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Great Britain and the Isle of Man. See type areas and sections of component units at group, subgroup, formation, member and bed levels. 
Reference(s):
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. 
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. 
McMillan, A A. 2005. A provisional Quaternary and Neogene lithostratigraphical framework for Great Britain. (Netherlands: Journal of Geosciences), 84-2, 87-107. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable