Code
ATWDM
Status
Formal (NAM & RGD 1980).
Lithological description
Consists of a marly, siltstone-sandstone alternation, well expressed on wire-line logs.
Depositional setting
Shallow-water open-marine environment.
Definition of lower boundary
Not yet defined.
Definition of upper boundary
Not yet defined.
Thickness indication
Generally less than 125 m, but up to 217 m in SPG-01.
Geographical distribution
Regional correlation
UK: West Sole Group; GER: Dogger Group; BEL: -.
Age
Bajocian.
Holostratotype
Well:
Depth (thickness) AH:
1953 - 2007 m (54 m)
Origin of name
None.
Previous name(s)
None.
Reviewed by (date)
Sander Houben (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]). Middle Werkendam Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/middle-werkendam-member.