Code
ZEZ4H
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
If fully developed it consists of relatively pure halite in its lower part, capped by potassium-magnesium-rich salt layers. This succession is overlain by two claystone beds, separated by rock salt.
Depositional setting
Marine.
Definition of lower boundary
Not yet determined.
Definition of upper boundary
Locally the Z4 Salt Member is overlain by a thin, recessive anhydrite, which may be called the Z4 Upper Anhydrite member (ZEZ4T).
Thickness indication
Up to 399 m.
Geographical distribution
Regional correlation
UK: Aller Halite Formation; GER: Aller Steinsalz; BEL: Z4 Salt Member.
Age
early Changhsingian.
Holostratotype
Depth (thickness) AH:
1235 - 1238 m (3 m)
Hypostratotype
Depth (thickness) AH:
4036 - 4088.5 m (52.5 m)
Parastratotype
Depth (thickness) AH:
2194 - 2246 m (52 m)
Origin of name
None.
Previous name(s)
None.
Reviewed by (date)
Mark Geluk (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 D, Permian. Mededelingen Rijks Geologische Dienst, 50, 1-42.
Cite as
TNO-GDN ([YEAR]). Z4 Salt Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/z4-salt-member.