Neomiodon Claystone Member

Formal (Van Adrichem Boogaert & Kouwe 1993).
Lithological description

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.

Depositional setting

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.

Thickness indication
Generally less than 120 m, but up to 171 m in P03-02.
Geographical distribution
Regional correlation
UK: Humber Group; GER: ?; BEL: -.
late Berriasian.
BK180090 (K18-Kotter-07-S2)
Depth (thickness) AH:
1881 - 1987 m (106 m)
Origin of name
Named after the fossil fresh-brackish water bivalve Neomiodon (syn. Cyrena), found abundantly throughout the sequence.
Previous name(s)
Reviewed by (date)
Sander Houben (2017).
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..
Cite as
TNO-GDN ([YEAR]). Neomiodon Claystone Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from