Oosterhout Formation NUOT

 

Derivatio nominis Named after the municipality of Oosterhout in the province of Noord-Brabant.
Type section Location map See figure (pdf)
  Well Oosterhout 44D/177
  Location N 51°39'17.3
E 04°33'07.1
  Depth 106.6 to 279.5 m
  Length 172.9 m along hole
  Reference Doppert et al (1975)
Additional section Location map See figure (pdf)
  Well Oosterhout 44D/214
  Location N 51°37'47.2
E 04°50'19.6
  Depth 111 to 183 m
  Length 72 m along hole
  Reference Doppert et al (1975)
  Well Klundert 43H/63 (pdf)
  Location N 51°51'28.4
E 04°10'20.2
  Depth 105 to 281 m
  Length 176 m along hole
  Reference NAM and RGD (1980)
  Well Hellevoetsluis-1 (pdf)
  Location N 51°51'28.3
E 04°10'20.2
  Depth 217 to 337 m
  Length 120 m along hole
  Reference NAM and RGD (1980)
Definition Succession of sands, sandy clays, and grey and greenish clays. The glauconite content is moderate to low. In the southern and northeastern parts of the Netherlands, the lower part of the formation consists of sands that are extremely rich in shells and bryozoans (‘Crag facies’). In most areas the latter deposits are overlain by clays.
Upper Boundary The upper boundary of the Oosterhout Formation is, in most places, taken at the top of a series of clay beds, which are overlain by shelly, fine-grained to coarse-grained sand with sparse clay intercalations and form part of the Early Pleistocene Maassluis Formation (NUMS)Doppert et al (1975) ; NAM and RGD (1980) ). A widespread hiatus occurs at this level. In the eastern Netherlands the Oosterhout Formation intertongues with, and is overlain by deposits of the continental Kieseloölite Formation and the continental to near-shore Scheemda Formation.
Lower Boundary The formation overlies beds that are rich in glauconite, but poor in shells, belonging to the Breda Formation.
Distribution The formation is present in the central and western Netherlands (with the exception of the extreme southwest), and the entire offshore area.
Age Pliocene. The topmost beds are locally earliest Pleistocene in age.
Depositional Setting The formation was deposited in a shallow-marine environment, partly in a delta-front setting and partly in an inner-neritic setting. The shelly ‘Crag facies’ is of a littoral nature.
Subdivision  
  No formal subdivision has been made. In the Dutch offshore mapping, the Brielle Ground Formation has been distinguished (BGS and RGD (1984b) ; BGS and RGD (1992) ). This is a seismo-stratigraphically defined unit, which is an approximate equivalent of the Oosterhout Formation.
References See References Tertiary

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