Z1 Lower Anhydrite Member ZEZ1A

 

Type section Location map See figure (pdf)
  Well Rossum-Weerselo-3 (pdf)
  Location N 52°21’03.5
E 06°54’38.2
  Depth 1725 to 1801 m
  Length 76 m along hole
  Reference NAM and RGD (1980)
Definition The Z1 Lower Anhydrite Member is composed of a massive anhydrite. Dolomite stringers occur frequently in the unit, thus rendering its distinction from the Z1 Fringe Carbonate Member difficult. The unit interfingers with the Z1 Middle Claystone Member, and thus may contain some clay in the sub-basins. Differentiation between these members may be difficult in places.
Upper Boundary The unit is only recognised in the presence of an overlying Z1 Salt Member
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].