Upper Coevorden Member

SKCFU

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

Section of brownish-grey, occasionally fine-sandy claystones, which are typically much less calcareous than the Middle Coevorden Member ('t Hart 1969). Locally highly bituminous, with paper-thin lamination.

Lagoonal to fresh-water lacustrine setting with repeated marine influences. Fines settled from suspension. Limestone (lumachelle/microcoquina) beds are interpreted as storm deposits or hardgrounds.

Upward drop in resistivity-log readings with the Middle Coevorden Member.

Either the silty marl/limestone succession of the Middle Coevorden Member or the basal, generally glauconitic beds of the Rijnland Group.

Generally less than 100 m, but up to 170 m in LOS-02.

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

Berriasian - earliest Valanginian.

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

Originally Upper 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..