Weiteveen Basal Clastic Member SKWFA


Premise Definition extended after NAM and RGD (1980) . Correlated with the Gigas Schichten - lower 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 1567 to 1590 m
  Length 23 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 1150 to 1196 m
  Length 46 m along hole
  Well De Bente-1 (pdf)
  Location N 52°41’37.8
E 06°46’15.7
  Depth 1327 to 1344 m
  Length 17 m along hole
  Well Oldenzaal-2 (pdf)
  Location N 52°17’18.8
E 06°56’23.8
  Depth 573 to 588 m
  Length 15 m along hole
Definition A sequence of variegated conglomerates, sandstones and claystones at the base of the Weiteveen Formation The conglomerates are highly polymict, and contain rounded claystone, marl, sandstone, and quartz pebbles. Limonite, coal and plant remains are common t Hart (1969) . Upwards, the deposits change into variegated, slightly dolomitic or anhydritic mudstones.
Upper Boundary Its upper boundary with the Weiteveen Lower Evaporite Member is placed at the base of the first distinct anhydrite or limestone bed, which coincides with the upward disappearance of variegated colours, typical for this member.
Lower Boundary The member unconformably overlies the Altena Group or older sediments.
Distribution .Dutch part of the Lower Saxony Basin which reaches the easternmost parts of the Dutch provinces of Groningen, Drente and Overijssel. The member is often missing in slightly elevated areas. The most coarse-grained devel-opment is seen in the east of the province of Overijssel (Twente).
Age Generally barren, but rare mid-Kimmeridgian to earliest Portlandian fossils have been encountered NAM and RGD (1980) . The member is placed in zone Upper Malm 1 or A of the regional ostracod zonation (Wolburg (1949) ; Sung (1955) ; t Hart (1969) ).
Depositional Setting Flood-plain to fluvial-plain setting with intermittent lacustrine conditions.
Sequence Stratigraphy This member is interpreted as scattered erosional remnants of sequences LZA 4.6 and 4.7.
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].