Middle Coevorden Member SKCFM

 

Premise Definition extended after NAM and RGD (1980) , originally Middle Coevorden Clay Member The lithological affix has been deleted. Equivalent to the upper B├╝ckeberg Folge of Kemper (1973)
Derivatio nominis Named after the town of Coevorden in the southeastern part of the Dutch 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 1041 to 1126 m
  Length 85 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 994 to 1010 m
  Length 16 m along hole
  Well Exloo Odoorn-2 (pdf)
  Location N 52°54’20.7
E 06°51’57.8
  Depth 1653 to 1697 m
  Length 44 m along hole
  Well De Bente-1 (pdf)
  Location N 52°41’37.8
E 06°46’15.7
  Depth 1109.5 to 1130 m
  Length 20.5 m along hole
  Well Oldenzaal-2 (pdf)
  Location N 52°17’18.8
E 06°56’23.8
  Depth 114.2 to 162 m
  Length 47.8 m along hole
Definition Section of grey, fossiliferous, silty/sandy claystones, which are typically far more calcareous than the Upper Coevorden or Lower Coevorden Members t Hart (1969) .
Upper Boundary The member is intercalated between the silty, little calcareous successions of the Upper Coevorden and Lower Coevorden Members. Where the Upper Coevorden Member has been truncated, it can be overlain by generally glauconitic sediments of the Rijnland Group, or by Tertiary rocks (Oldenzaal-2).
Lower Boundary The member is intercalated between the silty, little calcareous successions of the Upper Coevorden and Lower Coevorden Members.
Distribution The Dutch part of the Lower Saxony Basin, which covers the easternmost parts of the provinces of Groningen, Drente and Overijssel.
Age Ryazanian. In the local ostracod zonation the member covers Wealden 3 - 4 (Wolburg (1949) ; Sung (1955) ). Ostracods found in this member are Cypridea valdensis valdensis, C. jonesi, Theriosynoecum fittoni germanica and Paleocytheridea compacta.
Depositional Setting Marginal- to open-lacustrine setting with rare marine in-fluence. Fines settled from suspension. Limestone (microcoquina) beds are interpreted as storm deposits or periods of low sediment input (hardgrounds).
Sequence Stratigraphy Interpreted as the late Transgressive to early Highstand systems tracts of sequence LZB 1.6.
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].