Informal (Van Adrichem Boogaert & Kouwe 1993).
Predominantly fine-grained interval of grey, sandy to silty mudstones with thin intercalated sand, carbonate and coal beds, occasionally fossiliferous and/or sideritic.
Muddy coastal-plain, by settling from suspension during floodings. Thin sand sheets formed by crevasses, washovers, short transgressions and small-scale fluvial channels.
Definition of lower boundary
Definition of upper boundary
ln the Vlieland Basin, the Zurich Formation can be
subdivided into an informal 'upper member' and 'lower
member', often separated by an incursion of either the
Scruff Greensand Formation, the Kimmeridge Clay Formation or the Wadden Volcaniclastic Member.
late Kimmeridgian - Valanginian.
Origin of name
Named after the village Zurich near the coast of the province of Friesland.
Referred to as the Griend member by the RGD.
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..
TNO-GDN ([YEAR]). lower Zurich member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/lower-zurich-member.