Nieuwerkerk Formation SLDN

 

Premise Formation defined by van Adrichem Boogaert & Kouwe (1993). Contains deposits, which would formerly have been placed in the Delfland Formation, and which occur in the West Netherlands Basin or Roer Valley Graben. Sedi-ments assignable to this formation occurring in the on-shore part of the West Netherlands Basin have been described by Haanstra (1963) , Bodenhausen and Ott (1981) and other publications.
Derivatio nominis Named after the village of Nieuwerkerk in the province of Zuid-Holland, where the type well is located.
Type section Location map See figure (pdf)
  Well Nieuwerkerk-1 (pdf)
  Location N 51°57’00.1
E 04°37’32.3
  Depth 1052 to 1942 m
  Length 890 m along hole
Additional section Location map See figure (pdf)
  Well Woubrugge-1 (pdf)
  Location N 52°09’49.6
E 04°33’34.2
  Depth 562 to 1096 m
  Length 534 m along hole
Definition Sequence of typically dark or light grey, red or variegated claystones, fine- to medium-grained sandstones with bed thicknesses up to several meters, and coarse- grained, thick-bedded sandstones. Coal/lignite beds are associated with grey claystones, and are most common in the Rodenrijs Claystone Member and the youngest occurrences of Alblasserdam Member in the Rotterdam area. Dispersed lignitic matter, siderite spherulites and concretions are common. Cored sections show extensive mott-ling of the variegated claystones. Sands occur in sheets, isolated or stacked channels.
Upper Boundary The Rijnland Group onlaps onto this formation. Some interfingering is seen, especially on the southern basin margin zone. Therefore, both the Vlieland Sandstone Formation and the Vlieland Claystone Formation are partial lateral equivalents to the northwest.
Lower Boundary This formation unconformably overlies the Altena Group (marine claystones and sandy carbonates of the Aalburg Formation, Werkendam or Brabant Formation). Especially along the southern margin of the West Netherlands Basin, it can rests on deposits of Triassic or older age.
Distribution The Nieuwerkerk Formation is restricted to the West Netherlands Basin and Roer Valley Graben.
Age The Nieuwerkerk Formation generally has a Portlandian or Ryazanian age at the base, although locally deposits of Late Oxfordian/Kimmeridgian age have been encounter-ed. Sediments of Barremian age have been found in the southern margin of the West Netherlands Basin. Over most of the West Netherlands Basin, the formation was succeeded by the Vlieland Sandstone Formation during the mid-Hauterivian or Valanginian. In the Roer Valley Graben, erosional remnants of Late Oxfordian - Early Portlandian Nieuwerkerk Formation sediments have been encountered, but the main period of deposition did not commence until the Late Portlandian-Ryazanian.
Depositional Setting The sands are interpreted to have been deposited both as braided-river valley fills and meandering single-channel fills, and as crevasse-splays in a flood-plain to lower-coastal-plain setting. Fines have been laid down in an overbank setting during floods. Mottling and concretions reflect soil formation caused by fluctuating water-tables and long periods of non-deposition. The abundant plant remains indicate periods of dense vegetation, and a non-oxidised sediment column for their preservation.
Sequence Stratigraphy In the West Netherlands Basin and Roer Valley Graben the Nieuwerkerk Formation can reflect Haq (1988) ’s sequences LZA 4.4 to LZB 3.5. Sequences LZA 4.4 to LZB 1.4 seem to be re-stricted to erosional remnants, particularly in the axial part of the Roer Valley Graben. Major expansions of the depositional realm occurred during sequences LZB 1.5 to LZB 2.1. The Transgressive systems tracts of sequences LZB 1.5, LZB 1.6 and LZB 2.1 are marked by locally significant sand incursions. LZB 2.2 to LZB 2.5 are characterised by a well correlatable incursion of lagoonal (restrict-ed marine) sediments. During sequences LZB 2.3 to LZB 3.5 the terrestrial Nieuwerkerk Formation deposition was gradually replaced by the marine Rijnland Group. The most important flooding occurred during sequence LZB 3.1, which constitutes the base of the Rijswijk Member over most of the West Netherlands Basin.
Subdivision  
  Haanstra (1963) subdivided the sediments now contained in the Nieuwerkerk Formation into three intervals: ’Lower Valanginian’, ’Intermediate Series’ (also called ’Tuffa-ceous Series’) and ’Transitional Series’. The boundary between the Intermediate and Transitional Series ap-pears to coincide with the base of one of the depositional cycles (LZA 1.6) in the Nieuwerkerk Formation The ’Lower Valanginian’ can be compared with the Rodenrijs Claystone Member, and is marked by the start of marine influence. In NAM and RGD (1980) the Delfland Group in the West Netherlands Basin and Roer Valley Graben was not further subdivided. A tentative ’Roer Valley Graben Formation’ is mentioned there, but not defined. In this publication, the new Nieuwerkerk Formation is subdivided into three members. The Delft and Rodenrijs Claystone Members are clearly confined in time, space and character. The Alblasserdam Member is the member containing those parts of the Nieuwerkerk Formation not belonging to the Delft or Rodenrijs Claystone Mbs. It can show a considerable variation in character. The different reference sections of that member are intended to show this diversity.
  SL Schieland Group
  SLD Delfland Subgroup
  SLDN Nieuwerkerk Formation
  SLDNR Rodenrijs Claystone Member
  SLDND Delft Sandstone Member
  SLDNA Alblasserdam Member
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].