Landen Formation NLLF


Premise Originally defined by NAM and RGD (1980) , upper boundary redefined. Compared with the Belgian lithostratigraphy it comprises the Landen Group plus the underlying Heers and Opglabbeek Formations of the Haine-Haspengouw Group Marechal and Laga (1988) .
Derivatio nominis Named after the Belgian municipality 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
E 05°21'37.2
  Depth 1279 to 1425 m
  Length 146 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 In the southern part of the province of Noord-Brabant and in Limburg, the formation consists of fine-grained, glauconitic sands at the base, followed by marls and dark-grey clays, which are in turn overlain by sandy clays with fine-grained sandy intercalations. Locally, in northern Limburg, variegated clays and minor sand occur. Further north, the formation consists exclusively of grey to greenish grey clays with local marl intercalations (especially in the basal part of the member).
Upper Boundary Usually the Basal Dongen Sand or the Basal Dongen Tuffite Member overlies the Landen Clay Member with a sharp boundary. In southern Netherlands, where sands are intercalated in the upper part of the formation, the boundary with the Basal Dongen Sand Member is less evident. Where erosion has removed the Eocene deposits, the formation is unconformably overlain by the sands of the Oligocene Vessem Member with a sharp boundary.
Lower Boundary The lower boundary is characterised by an unconformity, expressed as a sharp lithologic and log break to formations where the unit overlies the Chalk Group.
Distribution The formation is absent on the ‘Southern Early Tertiary High’, in the very eastern part of the country and in the southern part of Limburg.
Age Paleocene (Thanetian). The formation is thought to cover the time interval characterised by nannofossil zones NP 6 to NP 9. Large parts of the formation do not yield calcareous fossils and only the NP 8-Zone has been recognised Verbeek (1988) . The foraminiferal assemblages are characteristic of the FJ-Zone.
Depositional Setting The Landen Formation was deposited in an initially transgressive, shallow-marine environment, followed by open-marine conditions. The upper part of the unit consists of regressive sands, probably related to NW-SE-oriented prograding deltaic lobes. Locally, the main marine development of the formation is preceded or followed by brackish conditions.
Sequence Stratigraphy The Landen Formation represents cycles TA 2.1 to 2.3.
  NLFFD Reusel Member
  NLLFC Landen Clay Member
  NLLFG Gelinden Member
  NLLFS Heers Member
  NLLFL Swalmen Member
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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