Code
RNKPS
Status
Formal (NAM & RGD 1980).
Lithological description
Halites, alternating with anhydrites and grey, anhydritic claystones in basinal settings, notably in the Central Graben, the northern part of the Off Holland Low and the Ems Low. The halites disappear towards the basin margin.
Depositional setting
Playa lake.
Definition of lower boundary
Not yet defined.
Definition of upper boundary
Not yet defined.
Thickness indication
The member has its greatest thickness in the Dutch Central Graben (> 400 m). In graben structures in the Ems Low, the thickness increases locally to more than 1000 m (Frisch & Kockel 1997).
Geographical distribution
Regional correlation
UK: Dudgeon Formation and Keuper Halite Member; GER: Grabfeld Formation (Unterer Gipskeuper); BEL: Main Keuper Evaporite Member.
Age
latest Ladinian - Carnian.
Holostratotype
Well:
Depth (thickness) AH:
3076 - 3247 m (171 m)
Parastratotype
Well:
Depth (thickness) AH:
1641 - 1670 m (29 m)
Parastratotype
Well:
Depth (thickness) AH:
1703 - 1738 m (35 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.
Frisch, U. & Kockel, F. 1997. Altkimmerische Bewegungen in Nordwestdeutschland. Brandenburgische Geowissenschaftliche Beiträge 4, 19–29.
Cite as
TNO-GDN ([YEAR]). Main Keuper Evaporite Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/main-keuper-evaporite-member.