Texel Marlstone Member CKTXM


Premise Amended after NAM and RGD (1980) . The ‘Actinocamax Plenus Marl’ formerly part of this unit, has now been split off and classified as a separate member.
Derivatio nominis Named after the predominant lithology of the lower part of the member.
Type section Location map See figure (pdf)
  Well L12-02 (pdf)
  Location N 53°20’24.5
E 04°45’42.6
  Depth 2326 to 2406 m
  Length 80 m along hole
  Reference (amended after NAM and RGD (1980) )
Additional section Location map See figure (pdf)
  Well De Lier-2 (pdf)
  Location N 51°58'43.9
E 04°13'39.4
  Depth 1084 to 1110 m
  Length 26 m along hole
  Reference (amended after NAM and RGD (1980) )
Definition White to light-grey, locally pinkish, limestones and marly chalks. South of the Broad Fourteens Basin and in the western parts of the West Netherlands Basin, marls and marly chalks predominate, whereas further north these lithologies are restricted to the lower part of this member.
Upper Boundary The upper boundary is placed at the base of the argillaceous Plenus Marl Member. Where this member is absent, the Texel Marlstone Member is overlain disconformably by the Ommelanden Chalk. In this situation two limestone units are in direct contact, which complicates locating this boundary. It may be found by tracing the truncated beds in the Texel Marlstone Member, which usually has a somewhat more irregular wire-line log pattern than the overlying Ommelanden Formation.
Lower Boundary The lower boundary is generally placed at the base of a distinctly more calcareous interval overlying the Upper Holland Marl Member. In the basin-margin setting this boundary lies on top of the highest sandstones of the underlying Texel Greensand Member.
Distribution The member is widespread in the southern North Sea and the Netherlands onshore. It is absent in the southernmost part of the North Sea area and the southern Dutch onshore area, as well as in the centres of areas with Subhercynian and Laramide inversion.
Age Cenomanian.
Depositional Setting The member was deposited under relatively deep marine conditions.
References See References Upper Cretaceous

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