Z1 Middle Claystone Member ZEZ1M


Premise Member defined by van Adrichem Boogaert & Kouwe (1994).
Type section Location map See figure (pdf)
  Well Q11-01 (pdf)
  Location N 52°25’08.0
E 04°22’33.0
  Depth 2828 to 2840 m
  Length 12 m along hole
Additional section Location map See figure (pdf)
  Well Buurmalsen-1 (pdf)
  Location N 51°54’18.7
E 05°18’49.2
  Depth 2020 to 2040 m
  Length 20 m along hole
  Well Everdingen (pdf)
  Location N 51°57’34.6
E 05°07’35.6
  Depth 1743 to 1765 m
  Length 22 m along hole
Definition The Z1 Middle Claystone Member consists of 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. The lower boundary has been placed at the top of the Z1(Werra) carbonate or anhydrite, while the upper boundary is placed at the base of the claystones of the Red-brown Salt Clay Member. Along the basin fringe, in places where an argillaceous development prevails, it may be impossible to distinguish the Red-Brown Salt Clay Member with certainty. In such cases this unit and the Z1 Middle Claystone Member may be lumped with the overlying Z2 Middle Claystone Member into an informal unit: the Zechstein Middle claystone (ZEFRM). An example of such a development is found in well Nederweert-1 (Annex D-9), interval 2594-2634 m below rt.
References See References Permian

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].