Landen Clay Member NLLFC

 

Premise The original definition by NAM and RGD (1980) was amended, because the Gelinden Member has been split off from the Landen Clay Member. The Landen Clay Member in the southeastern Netherlands corresponds essentially with the Belgian Waterschei Member of the Hannut Formation. The latter is part of the Landen Group in Belgian lithostratigraphy Marechal and Laga (1988) .
Derivatio nominis Named after the town of Landen in the Belgian province of Brabant.
Type section Location map See figure (pdf)
  Well Veldhoven-1 (pdf)
  Location N 51°26'20.8
E05°21'37.2
  Depth 1363 to 1395 m
  Length 32 m along hole
  Reference (amended after NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well K17-02 (pdf)
  Location N 53°04'33.5
E 03°30'51.4
  Depth 998 to 1069 m
  Length 71 m along hole
  Reference NAM and RGD (1980)
Definition Generally dark-green, hard, flaky clay, somewhat silty, containing glauconite, pyrite and mica. The basal part of the member can be marly and of a lighter colour. In the eastern Netherlands (closer to the palaeo-coastline) the clay is fine-sandy to silty and its colour greenish, also brown. The member contains very little glauconite and is strongly burrowed.
Upper Boundary In the southeastern Netherlands, the upper boundary is formed by the somewhat gradual transition to the sandy Reusel Member. Elsewhere in the Netherlands the Landen Clay Member conformably overlies the Heers Member and is overlain by the Basal Dongen Sand Member, which both have lower gamma-ray and spontaneous potential readings. Where the Heers Member is absent, the Landen Clay member unconformably overlies deposits of Mesozoic or older age. Against the flanks of the ‘Southern Early Tertiary High’ and locally in the northeastern Netherlands the unit is unconformably overlain by younger deposits.
Lower Boundary The lower boundary in most of the southeastern Netherlands is the somewhat gradual transition to the Gelinden Member. On gamma-ray logs the Landen Clay Member displays higher values than the Gelinden Member; on resistivity logs the reverse.
Distribution The member is present all over the Netherlands on- and offshore, with the exception of the ‘Southern Early Tertiary High’ and the very eastern part of the Netherlands as a result of later erosion and/or non-deposition.
Age Late Paleocene (Thanetian). The member is thought to cover the time interval characterised by nannofossil zones NP 6 to 9. Large parts do not yield calcareous fossils and only the NP 8 has been recognised Verbeek (1988) . The foraminiferal assemblages are characteristic of the FJ-Zone of Doppert and Neele (1983) .
Depositional Setting Open-marine environment, the water depth was probably some tens to hundreds of metres.
Sequence Stratigraphy The unit corresponds at least with the Transgressive and Highstand systems tracts of cycle TA 2.1, probably also with the Highstands of TA 2.2 and 2.3.
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].