Texel Marlstone Member

Code
CKTXM
Status
Formal (NAM & RGD 1980).
Lithological description

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.

Depositional setting

Relatively deep marine conditions, below wave base.

Definition of lower boundary

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.

Definition of upper boundary

Placed at the base of the argillaceous Plenus Marl Member. Where this member is absent, the Texel Marlstone Member is overlain unconformably by the Ommelanden Formation. In this situation two limestone units are in direct contact, which complicates locating the 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.

Thickness indication
Up to 250 m.
Geographical 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.
Regional correlation
UK: Hidra Formation; GER: Helgoland & Brochterbeck formations; BEL: Bernissart & Hainaut formations.
Age
Cenomanian.
Holostratotype
Depth (thickness) AH:
2326 - 2406 m (80 m)
Parastratotype
Depth (thickness) AH:
1084 - 1110 m (26 m)
Origin of name
Named after the predominant lithology of the lower part of the member.
Previous name(s)
None.
Reviewed by (date)
Mark Geluk, Geert-Jan Vis (June 2017).
References
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Cite as
TNO-GDN ([YEAR]). Texel Marlstone Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/texel-marlstone-member.