| Computer Code: |
NSG |
Preferred Map Code: |
NSG |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
A suite of glacial, glaciofluvial, glaciolacustrine and possibly glaciomarine deposits that contain clasts derived predominantly from northeast England (yellow, grey and white sandstones, mudstone, limestone, coal, dolerite), southern Scotland (greywacke sandstone and mudstone, granite, andesite, red sandstone) and offshore (marl, gypsum, chalk). Including clayey diamictons (till), sand, gravel, silt and clay. Deposited by ice sourced mainly in the Scottish Borders and central Scotland that flowed southeastwards along the eastern coast of England (but mainly offshore) as far as north Norfolk. |
| Definition of Lower Boundary: |
Sharp, unconformable, mainly planar contact with units of the North Sea Coast (Albion) Glacigenic Subgroup, or with bedrock. |
| Definition of Upper Boundary: |
Ground surface or unconformable contact with various units of the Brittania Catchments Group or British Coastal Deposits Group. Lateral interdigitation with units of the North Pennine Glacigenic Subgroup. |
| Thickness: |
To 50m |
| Geographical Limits: |
The North Sea coast and coastal plains of northeastern and eastern England between Berwick-upon-Tweed and north Norfolk. |
| Parent Unit: |
Caledonia Glacigenic Group (CALI)
|
| Previous Name(s): |
North Sea Drift [Obsolete Name and Code: Use NSCA, NSG]
(-1095)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The North Sea coast and coastal plains of north-eastern and eastern England. Ehlers et al., 1991. See also the stratotypes of constituent formations. |
| Reference(s): |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| Ehlers, J, Gibbard, P L and Rose, J [editors]. 1991. Glacial deposits in Great Britain and Ireland. Balkema: Rotterdam, 580pp. |
| Boulton, G S. 1992. Quaternary. 413-444 in Geology of England and Wales. Duff, P M D, and Smith, A J (editors). (London: The Geological Society.) |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
