Weiteveen Lower Marl Member SKWFC

 

Premise Definition extended after NAM and RGD (1980) . Correlated with the upper Middle M√ľnder Marl in Germany by t Hart (1969) .
Derivatio nominis Named after the village of Weiteveen, municipality of Schoonebeek, in the southeastern part of the province of Drente.
Type section Location map See figure (pdf)
  Well Schoonebeek-197 (pdf)
  Location N 52°38’58.0
E 07°02’34.2
  Depth 1428 to 1470 m
  Length 42 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well Ruinen-1 (pdf)
  Location N 52°44’09.8
E 06°27’12.8
  Depth 1130 to 1140 m
  Length 10 m along hole
  Well De Bente-1 (pdf)
  Location N 52°41’37.8
E 06°46’15.7
  Depth 1268 to 1301 m
  Length 33 m along hole
  Well Oldenzaal-2 (pdf)
  Location N 52°17’18.8
E 06°56’23.8
  Depth 436 to 482 m
  Length 46 m along hole
Definition A blue-grey marly, locally anhydritic or pebbly claystone succession intercalated between the two evaporite members of the Weiteveen Formation
Upper Boundary The higher clay content clearly distinguishes this member from the overlying evaporitic members. This can be seen on wire-line logs: higher GR-, lower re-sisitivity- and sonic-log readings.
Lower Boundary The higher clay content clearly distinguishes this member from the underlying evaporitic members. This can be seen on wire-line logs: higher GR-, lower resisitivity- and sonic-log readings.
Distribution Dutch part of the Lower Saxony Basin, which reaches the easternmost parts of the Dutch provinces of Groningen, Drente and Overijssel. May be absent over salt swells and domes.
Age Early to mid-Portlandian. t Hart (1969) states that in-situ fossils are extremely rare in this interval, and that its age is largely derived from its stratigraphic position. Ostra-cod zone Upper Malm 3 or C (Wolburg (1949) ; Sung (1955) ; t Hart (1969) ).
Depositional Setting Floodplain to highly-restricted lacustrine basin-margin or marginal-marine sub-basin setting.
Sequence Stratigraphy The member mainly represents the Transgressive to Early Highstand systems tract of sequence LZB 1.2., but along the basin margin the member can also incorporate the Highstand interval of sequence LZB 1.1. The main phase of deposition of this member coincides with a flooding, marked by the start of Argillaceous Scruff Member and Kimmeridge Clay Formation deposition in the southern Central Graben.
References See References Upper Jurassic/ Lower Cretaceous

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