Formal (Van Adrichem Boogaert & Kouwe 1993).
Sequence of claystones, medium- to dark-grey and grey-brown, carbonaceous with common to abundant shell debris, dominated by the bivalve Neomiodon spp. Thin sandstones are developed locally.
The lower part: lacustrine to lagoonal environment with restricted-marine influence. The upper part: marginal-marine (lagoonal).
Definition of lower boundary
Unconformably underlain by the Bloemendaal Member, or in rare locations the Neomiodon Claystone Member can unconformably rest on older members of the Breeveertien Formation.
Definition of upper boundary
Formed by the Late Kimmerian IIb unconformity, which is covered by the Vlieland Sandstone Formation.
Generally less than 120 m, but up to 171 m in P03-02.
UK: Humber Group; GER: ?; BEL: -.
Origin of name
Named after the fossil fresh-brackish water bivalve Neomiodon (syn. Cyrena), found abundantly throughout the sequence.
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]). Neomiodon Claystone Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/neomiodon-claystone-member.