Code
NU
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1997). The NU-Group, NM-Group and NL-Group can be taken together as North Sea Supergroup (code N).
Lithologische beschrijving
Clay and fine-grained to coarse sand, locally gravel or peat and brown-coal seams. There is a general trend from coarse- to fine-grained sediments towards the north and west.
Afzettingsmilieu
Shallow-marine, mainly deposited in the western Netherlands, and fluvial, paralic and lacustrine. In the upper part glacigenic.
Definitie ondergrens
In most places, the succession unconformably overlies the Middle North Sea Group, or older beds.
Definitie bovengrens
Present-day land surface or sea floor.
Dikte indicatie
Up to 1500 m.
Geografische verbreiding
Regionale correlatie
UK: upper part of the Westray Group and the Nordland Group; GER: no equivalent group; BEL: no equivalent group.
Ouderdom
Miocene - Holocene.
Holostratotype
Well:
Depth (thickness) AH:
0 - 234 m (234 m)
Oorsprong naam
Named after the North Sea. The prefix ‘Upper’ is used to denote the upper part of the clastic sequence above the Chalk Group.
Vorige benaming(en)
None.
Gereviewed door (datum)
Geert-Jan Vis (2019).
Referenties
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1997. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section I, Tertiary. Mededelingen Rijks Geologische Dienst, 50, 1-39.
Cite as
TNO-GDN ([YEAR]). Upper North Sea Group. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/upper-north-sea-group.