Code
RNMUA
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
Light greenish/grey marlstone unit, contains anhydrite beds in the basal part. The member displays an increase in clay content towards the top.
Depositional setting
Marine.
Definition of lower boundary
Not yet defined.
Definition of upper boundary
Not yet defined.
Thickness indication
Varies between 20 m and up to 94 m.
Geographical distribution
Regional correlation
UK: Dowsing Formation; GER: Middle Muschelkalk Formation; BEL: Middle Muschelkalk Marl Member.
Age
middle Anisian.
Holostratotype
Well:
Depth (thickness) AH:
1420 - 1488 m (68 m)
Parastratotype
Well:
Depth (thickness) AH:
3443 - 3550 m (107 m)
Hypostratotype
Well:
Depth (thickness) AH:
1706 - 1747 m (41 m)
Origin of name
None.
Previous name(s)
None.
Reviewed by (date)
Johan ten Veen (2017).
References
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section E, Triassic. Mededelingen Rijks Geologische Dienst, 50, 1-28.
Cite as
TNO-GDN ([YEAR]). Middle Muschelkalk Marl Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/middle-muschelkalk-marl-member.