Computer Code: |
BNB |
Preferred Map Code: |
notEntered |
Status Code: |
Pending Upgrade |
Age range: |
Marine Isotope Stage 5e (QMIS005E)
— Marine Isotope Stage 4 (QMIS004) |
Lithological Description: |
Brackish-marine, grey-brown silty clays. Pass upwards into lacustrine clays in the east, include interbeds gravelly sand towards base in west. Extensively bioturbated, locally cryoturbated. |
Definition of Lower Boundary: |
Overlies Eemian Marine Sands in type area, also overlies early and middle Pleistocene sediments (unconformably) in British sector. |
Definition of Upper Boundary: |
Overlain by Holocene Marine Sands or (locally) Weichselian Periglacial Sands (Twente Formation). |
Thickness: |
0 - 10m. (maximum 25m. in British Sector of Flemish Bight). |
Geographical Limits: |
Not defined. |
Parent Unit: |
California Glacigenic Group (CALIF)
|
Previous Name(s): |
Brown Bank Bed [Obsolete Name and Code: Use BNB]
(-4480)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Stoker, M S, Balson, P S, Long, D, and Tappin, D R. 2011. An overview of the lithostratigraphical framework for the Quaternary deposits on the United Kingdom continental shelf. British Geological Survey Research Report, RR/11/03. 48pp. |
Oele, E. 1971. The Quaternary Geology of the southern area of the Dutch part of the North Sea. Geologie En Mijnbouw, Vol 50, 461-474. |
Cameron, T D J, Crosby, A, Balson, P S, Jeffery, D H, Lott, G K, Bulat, J, and Harrison, D J. 1992. United Kingdom offshore regional report: the geology of the southern North Sea. (London: HMSO for the British Geological Survey.) |
Cameron, T D J, and Holmes, R. 1999. The Continental Shelf. 125-139 in A revised correlation of Quaternary deposits in the British Isles. Bowen, D Q (editor). Special Report of the Geological Society of London, No. 23. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |