Middle Coevorden Member

SKCFM

Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1993).

Section of grey, fossiliferous, silty/sandy claystones, which are typically far more calcareous than the Upper Coevorden or Lower Coevorden Members ('t Hart 1969).

Marginal- to open-lacustrine setting with rare marine influence. Fines settled from suspension. Limestone (microcoquina) beds are interpreted as storm deposits or periods of low sediment input (hardgrounds).

With the Lower Coevorden Members.

With the Upper Coevorden. Where the Upper Coevorden Member has been truncated, it can be overlain by generally glauconitic sediments of the Rijnland Group, or by the North Sea Supergroup rocks.

Generally less than 100 m, up to 150 m in LOS wells.

UK: ?; GER: Bückeberg Formation (Wealden); BEL: -.

Berriasian.

Named after the town of Coevorden in the southeastern part of the Dutch province of Drente.

Middle Coevorden Clay member.

Sander Houben (2017).

‘t Hart, B.B. 1969. Die Oberjura- und Unterkreide-Sedimentation in den nördlichen und östlichen Niederlanden - Erdöl und Kohle, Erdgas, Petrochemie, 22, p. 253-261.

NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..