Code
ZEZ1M
Status
Formal (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
Red, light-red to light-grey claystone and siltstone, interbedded with anhydrite. It may contain some sandstone beds, in particular in the Off Holland Low.
Depositional setting
Fine-grained mudflat - sabkha deposit.
Definition of lower boundary
Placed at the top of the Z1 Anhydrite or the Z1 Fringe Carbonate members.
Definition of upper boundary
Upper boundary is placed at the base of the claystones of the Red-brown Salt Clay Member.
Thickness indication
Up to 80 m.
Geographical distribution
Southern part of the country in the basin fringe area
Regional correlation
UK: ?; GER: ?; BEL: Z1 Middle Claystone Member.
Age
early Wuchiapingian.
Holostratotype
Well:
Depth (thickness) AH:
2828 - 2840 m (12 m)
Parastratotype
Well:
Depth (thickness) AH:
2020 - 2040 m (20 m)
Parastratotype
Well:
Depth (thickness) AH:
1743 - 1765 m (22 m)
Origin of name
None.
Previous name(s)
None.
Reviewed by (date)
Mark Geluk (2017).
References
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]). Z1 Middle Claystone Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/z1-middle-claystone-member.