Zechstein Upper Claystone Formation ZEUC

 

Premise Formation defined by van Adrichem Boogaert & Kouwe (1994). First described by RGD (1991) in the present interpretation. The upper part of this new formation was formerly included in the now abandoned Basal Buntsandstein Member of NAM and RGD (1980) .
Derivatio nominis Name applied to the claystone beds between the highest Zechstein evaporite and the base of the Lower Germanic Trias Group. These claystones were formerly attributed to the Basal Buntsandstein Member of Lower Buntsandstein Formation or to the basal part of the Bunter Formation (NAM and RGD, 1980).
Type section Location map See figure (pdf)
  Well Rossum-Weerselo-3 (pdf)
  Location (N 52°21’03.5
E 06°54’38.2
  Depth 1212 to 1235 m
  Length 23 m along hole
  Reference .
Additional section Location map See figure (pdf)
  Well Uithuizermeeden-1 (pdf)
  Location N 53°26’58.9
E 06°48’29.2
  Depth 2178 to 2194 m
  Length 16 m along hole
  Reference (main-basin setting).
  Well Drouwenerveen-Zuideind-1 (pdf)
  Location N 53°57’41.7
E 06°52’16.9
  Depth 3992 to 4017 m
  Length 25 m along hole
  Reference (main-basin setting).
  Well P09-01A (pdf)
  Location N 52°32’19.4
E 03°44’52.2
  Depth 4378 to 4418 m
  Length 40 m along hole
  Reference (southern offshore development).
  Well Q11-01 (pdf)
  Location N 52°25’08.0
E 04°22’33.0
  Depth 2711 to 2720 m
  Length 9 m along hole
  Reference (southern offshore development).
  Well Q16-02 (pdf)
  Location N 52°07’05.3
E 04°07’15.3
  Depth 3817 to 3823 m
  Length 6 m along hole
  Reference (southern offshore development).
  Well Everdingen-1 (pdf)
  Location N 51°57’34.6
E 05°07’35.6
  Depth 1708 to 1712 m
  Length 4 m along hole
  Reference (southern onshore development).
Definition Interval between the highest recognisable carbonate, evaporite or siliciclastic member or formation of the Zechstein Group and the base of the Lower Germanic Trias Group. In the fringe area, this formation may even overlie the Upper Rotliegend Group. Lithologically the formation is composed of red-brown to pale brown, occasionally grey-green claystones with some anhydrite and/or carbonate stringers. These claystones often show remarkably low velocities on the acoustic log. In the upper part thin, well-cemented, sandy beds may occur.
Lower Boundary The lower boundary has been placed at the top of the highest underlying Zechstein evaporite or clastic member or formation, the upper boundary is formed by the base of the Lower Germanic Trias Group. In the basin the unit rests directly on the Z4 Salt Member or Z5 Salt Member, whereas in the fringe area it can directly overlie the Z3 Carbonate, the sandstone members of the Z3 (Leine) and the Z4 (Aller) Formations or locally even the Upper Rotliegend Group.
Distribution The formation is present in the entire distribution area of the Zechstein Group, unless truncated locally by later erosion..
Age Thuringian, Late Permian.
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].