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).
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.
Shallow-marine, mainly deposited in the western Netherlands, and fluvial, paralic and lacustrine. In the upper part glacigenic.
Definition of lower boundary
In most places, the succession unconformably overlies the Middle North Sea Group, or older beds.
Definition of upper boundary
Present-day land surface or sea floor.
Up to 1500 m.
UK: upper part of the Westray Group and the Nordland Group; GER: no equivalent group; BEL: no equivalent group.
Miocene - Holocene.
Origin of name
Named after the North Sea. The prefix ‘Upper’ is used to denote the upper part of the clastic sequence above the Chalk Group.
Reviewed by (date)
Geert-Jan Vis (2019).
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.
TNO-GDN ([YEAR]). Upper North Sea Group. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/upper-north-sea-group.