Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1993).
Thin interval of light- to dark-grey, silty to fine-grained sandy, often marly claystone with open-marine to lagoonal fauna and flora. Thin argillaceous sand beds are intercalated.
Marginal- to open-marine environment.
Definition of lower boundary
With the fine-grained paralic (Rodenrijs Claystone Member) and fluvial deposits of the Nieuwerkerk Formation, is sharp.
Definition of upper boundary
With the IJsselmonde Sandstone Member of the Vlieland Sandstone Formation, is gradual, but placed at the base of the massive sandstone.
Up to 85 m.
UK: Valhall Formation; GER: ~Minden-Braunschweig-Gruppe; BEL: -.
Origin of name
Named after the former village of IJsselmonde, currently incorporated into Rotterdam.
Reviewed by (date)
Sander Houben (2017).
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..
TNO-GDN ([YEAR]). IJsselmonde Claystone Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/ijsselmonde-claystone-member.