Vlieland Claystone Formation KNNC


West Netherlands Basin
Premise Formation defined by van Adrichem Boogaert & Kouwe (1993). The status of the former Vlieland Formation and the former Vlieland Claystone Member NAM and RGD (1980) have been raised to that of an informal subgroup of the Rijnland Group, resp. a formation. The justification for the maintainance of the name ’Vlieland’ for both the sandstone and the claystone formation is discussed in paragraph 6.1. For the sake of purity the lithological affix has been changed from ’Shale’ to ’Claystone’.
Derivatio nominis Named after the Dutch Wadden island of Vlieland, where the reference well is located.
Type section Location map See figure (pdf)
  Well Vlieland Oost-1 (pdf)
  Location N 53°17’22.2
E 05°04’17.6
  Depth 1650 to 2200 m
  Length 550 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well Ruinen-1 (pdf)
  Location N 52°44’09.8
E 06°27’12.8
  Depth 848 to 956 m
  Length 108 m along hole
  Reference NAM and RGD (1980)
  Reference Well Berkel Schiebroek-2 is deleted as a reference section for the Vlieland Claystone Formation Correlation with modern logs has revealed the presence of the De Lier Member and Eemhaven Claystone Member
Definition Dark brownish-grey to grey claystone. Mica and very fine lignitic matter are common. Generally, the claystones are only very slightly calcareous. In offshore areas the upper part of the formation can locally be very calcareous. In the West Netherlands and Broad Fourteens Basin the formation is very silty to sandy with many intercalated siltstone and very fine sandstone beds, especially along the basin margin.
Upper Boundary The top is taken at the virtually conformable contact with the marly Holland Formation, or the clearly unconformably contact with the Chalk Group or Lower North Sea Group. The normal upper boundary, with the Holland Formation, is sharp. In the West Netherlands Basin the upper boundary with the De Lier Member (Vlieland Sandstone Formation) is gradual.
Lower Boundary Where the Vlieland Sandstone Formation is present, the more or less conformable contact with that formation is generally quite sharp. Otherwise, the Vlieland Claystone Formation can rest unconformably on a wide range of older formations
Distribution Most of the Netherlands’ offshore area (except for the southernmost part), West Netherlands Basin, the northern onshore area and Lower Saxony Basin. The Vlieland Sandstone Formation (several members) and the youngest Nieuwerkerk Formation in the West Netherlands Basin, Broad Fourteens Basin and Roer Valley Graben are laterally equivalent (all intertongue with the Vlieland Claystone Formation).
Age Depending on the position in the basin, Valanginian to Barremian/Early Aptian.
Depositional Setting Generally considered as deposited in a shallow- to fairly deep-marine (middle- to outer-neritic) setting, where fines and minor carbonates settled. Thin sand layers were deposited mainly during storms and lowstand periods
Sequence Stratigraphy Depending on the position in the basin, only the later Transgressive to Early Highstand systems tracts of Haq (1988) ’s sequences LZB 2.1 - 3.5, or the full sequences can be developed as Vlieland Claystone Formation.
  In the Broad Fourteens Basin, West Netherlands Basin and Lower Saxony Basin intertonguing of the Vlieland Sandstone and Vlieland Claystone Formations is found. Therefore several basin-restricted members are in use:
  KN Rijnland Group
  KNN Vlieland Subgroup
  KNNC Vlieland Claystone Formation
  Northern Netherlands’ Offshore
  KNNCK Vlieland Marl Member
  KNNCU Eemhaven Claystone Member
  KNNCA IJsselmonde Claystone Member
  Lower Saxony Basin
  KNNCW Westerbork Formation
  KNNCE Ruinen Member
  KNNCV Bentheim Claystone Member
  The Vlieland Claystone Formation outside the specific members may informally be assigned to the main Vlieland Claystone mb. (KNNCM).
References See References Upper Jurassic/ Lower Cretaceous

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