Code
RNMUL
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
Light-greenish/grey limestone, dolomite and marl beds. The member is characterized by a considerable carbonate content throughout the Netherlands. In the southern and western onshore area, the claystone content is relatively high and anhydrites occur locally.
Depositional setting
Very shallow sea with fluctuating salinities, inner- (epeiric) carbonate ramp with storm influence.
Definition of lower boundary
Not yet determined.
Definition of upper boundary
Not yet determined.
Thickness indication
Less than 50 m (London-Brabant Massif and the Mid North Sea High), over 150 m (Dutch Central Graben and the Ems Low).
Geographical distribution
Regional correlation
UK: Dowsing Formation; GER: Lower Muschelkalk Formation (Wellenkalk); BEL: Lower Muschelkalk Member. In the area of the city of Winterswijk, the name 'Vossenveld Formation' is used for sediments that can be correlated with the Lower Muschelkalk Member outcropping in the Winterswijk Quarry (operated by Sibelco).
Age
middle Anisian.
Holostratotype
Well:
Depth (thickness) AH:
1480 - 1601 m (121 m)
Parastratotype
Well:
Depth (thickness) AH:
3550 - 3650 m (100 m)
Hypostratotype
Well:
Depth (thickness) AH:
1767 - 1870 m (103 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]). Lower Muschelkalk Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/lower-muschelkalk-member.