Upper North Sea Group NU

 

Premise Definition by NAM and RGD (1980) . This group comprises basically the post-Oligocene sediments in the Netherlands. Over most of the country an important break in sedimentation occurred around the Oligocene-Miocene boundary. Only in the Roer Valley Graben and its southeastern continuation in Germany and part of the Peel area, was the sedimentation not or only slightly interrupted.
  The Quaternary formations, which form part of the Upper North Sea Group, will not be dealt with here. They have been described by Doppert et al (1975) for the onshore realm, and by Cameron et al (1989) , Cameron et al (1989b) , Laban (1995) for the offshore realm.
Derivatio nominis Named after the North Sea. The prefix ‘Upper’ is used to denote the upper part of the clastic sequence above the Chalk Group.
Type section Location map See figure (pdf)
  Well Rijsbergen 5OA/154 (pdf)
  Location N 51°30'50.5
E 04°39'15.4
  Depth 0 to 234 m
  Length 234 m along hole
  Reference NAM and RGD (1980)
Definition Sequence of clays and fine-grained to coarse sands, locally gravel or peat and brown-coal seams. There is a general trend from coarse- to fine-grained sediments towards the north and west.
Upper Boundary The top is formed by the present land surface or sea floor.
Lower Boundary In most places, the succession unconformably overlies the Middle North Sea Group, or older beds.
Distribution The group is present over almost the entire Netherlands. In the extreme east, southeast and southwest, it may be absent as a result of local erosion or non-deposition.
Age Miocene to Quaternary.
Depositional Setting The group consists of shallow-marine sediments, mainly deposited in the western Netherlands, and of terrestrial beds of a fluvial, paralic and lacustrine origin. In the upper part glacigenic deposits occur.
Subdivision  
  The Upper North Sea Group, as far as treated in this publication, can be subdivided into two marine and four predominantly continental formations.
  NU Upper North Sea Group
  marine development:
  NUOT Oosterhout Formation
  NUBA Breda Formation
  continental and near-shore development:
  NUKO Kieselo√∂lite Formation
  NUIN Inden Formation
  NUVI Ville Formation
  NUSA Scheemda Formation
References See References Tertiary

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].