| Computer Code: |
NBRG |
Preferred Map Code: |
NBGL |
| Status Code: |
Full |
| Age range: |
Wolstonian Stage (QO)
— Devensian Stage (QD) |
| Lithological Description: |
[Obsolete: use CALI]
The group comprises all formations and lithogenetic units of glacigenic deposits of Oxygen Isotope Stage 6 equivalent and younger. These deposits commonly form the surface deposits of northern Britain and are mainly confined to land lying to the north of the main Devensian ice sheet limit. Being the products of the latest glaciations the deposits commonly have distinct morphological expression and this morphology may form an important part of the definition of component formations and offspring units. Lithologies are diamicton, gravel, sand, silt and clay.
Provisional term in draft framework (equivalent of Northern Britain Glacigenic Group of McMillan and Hamblin, 2000); Devensian glacigenic deposits reassigned to the Caledonia Glacigenic Group (CALI). |
| Definition of Lower Boundary: |
Unconformable on bedrock of Neogene age or older, locally unconformable on older Quaternary deposits. |
| Definition of Upper Boundary: |
Conformable or unconformable contact with non-glacigenic deposits of Late Devensian and Holocene age. |
| Thickness: |
To 200m |
| Geographical Limits: |
Onshore UK north of the Main Devensian Ice Sheet limit. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Newer Drift [Obsolete Name and Code: Use CALI, NBRG]
(-3269)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| McMillan, A A and Hamblin, R J O, 2000. A mapping-related lithostratigraphical framework for the Quaternary of the UK, Quaternary Newsletter, 92, 21-34. |
| Catt, J A and Penny, L F, 1966. The Pleistocene deposits of Holderness, East Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.35, 375-420. |
| Rose, J, 1989. Stadial type sections in the British Quaternary, 45-67 in Quaternary Type Sections: Imagination or Reality ? Rose, J and Schluchter (Editors). Balkema, Rotterdam. |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| 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. |
| Browne, M A E, and McMillan, A A. 1989a. Quaternary geology of the Clyde valley. British Geological Survey Research Report, SA/89/1. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
