Rupel Formation NMRF


Premise Original definition by NAM and RGD (1980) . Amended to include a number of coarsening-upwards sequences below the main transgressive sand at the base of the formation, and to exclude the clay layers that directly overlie the sands at the top in its southern development. The Belgian Rupel Group Marechal and Laga (1988) largely corresponds with the Rupel Formation. The latter locally comprises slightly older beds as well (see 3.2.1 Vessem Member).
Derivatio nominis Named after the river Rupel in Belgium.
Type section Location map See figure (pdf)
  Well Veldhoven-1 (pdf)
  Location N 51°26'20.8
E 05°21'37.2
  Depth 1103 to 1229 m
  Length 126 m along hole
  Reference (amended after NAM and RGD (1980) )
Additional section Location map See figure (pdf)
  Well Asten-1 (pdf)
  Location N 51°23'47.7
E 05°47'27.3
  Depth 1300 to 1410 m
  Length 110 m along hole
  Well Doornspijk-2 (pdf)
  Location N 52°24'36.2
E 05°46'15.6
  Depth 715 to 779 m
  Length 64 m along hole
  Depth NaN to NaN ft
  Length NaN ft along hole
  Reference NAM and RGD (1980)
Definition The main part of the formation consists of heavy, dark brown-grey clays. Towards both base and top, the clays grade, rather abruptly, into sands along the southern basin margin.
Upper Boundary The Rupel Formation is conformably or mildly unconformably overlain in the central and eastern Netherlands, and part of the northeastern offshore by the sands and silty shales of the Veldhoven Formation. In the southern Netherlands the latter has a typical, thin clay interval at its base. Where Early Miocene erosion occurred, an unconformable contact exists with the overlying Breda Formation, which consists of glauconitic sands and clays.
Lower Boundary The formation unconformably overlies the Tongeren Formation, the Dongen Formation or older sediments. In those areas where the sandy development at the base is missing, the clays of the Rupel Formation rest directly on the Asse or Dongen Clay Members, which complicates definition of the boundary. However, on wire-line logs the Rupel clays show a somewhat higher gamma-ray response compared to the clays of the Lower North Sea Group. Biostratigraphic data may assist in establishing this boundary.
Distribution The Rupel Formation is present in most of the Netherlands on- and offshore area. It is absent in the extreme south and east of the country, on part of the Kijkduin High and locally in the western offshore.
Age Priabonian to Rupelian (NP 19/20 -NP 24). The foraminiferal assemblages are characteristic of the FF-Zone.
Depositional Setting The clays have been deposited in a middle to outer neritic setting. The sands are of a shallow-marine origin with intercalated lagoonal sediments.
Sequence Stratigraphy The Rupel Formation comprises sediments of Haq (1988) ’s sequences TA 4.2- TA 4.5.
  The formation has been subdivided into the following three members:
  NMRF Rupel Formation
  NMRFT Steensel Member
  NMRFC Rupel Clay Member
  NMRFV Vessem Member
  Local subdivisions have been made for the eastern Netherlands (Achterhoek and Twente, see Figure I.1) by van den Bosch (1975) . They distinguish:
  NMRFW Winterswijk Member
  NMRFH Brinkheurne Member
  NMRFR Ratum Member
  The Ratum Member corresponds with the Vessem Member, whereas the Brinkheurne and Winterswijk Members can be correlated with the Rupel Clay Member.
  The Winterswijk Member consists of silty clay with intercalated very fine-grained sands. For further details the reader is referred to van den Bosch (1975) .
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].