Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1993).
Alternation of fine-grained, argillaceous sandstones and brown-grey silty to sandy claystones. Locally sideritic concretions are present. In the lower part the claystone intervals often are dominant.
Shallow-marine (lower-shoreface), associated with the foreshore to upper-shoreface of a coastal-barrier system (Berkel Sandstone Member) prograding to the west and northwest.
Definition of lower boundary
Sharp boundary with the Rijswijk Member, placed at the top of the massive marine sand.
Definition of upper boundary
Gradual boundary with the Berkel Sandstone Member, normally taken at the base of the first massive, clean and porous sand.
UK: Valhall Formation; GER: ~Minden-Braunschweig-Gruppe; BEL: -.
late Hauterivian - early Barremian.
Origin of name
Named after the village of Berkel near Rotterdam.
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]). Berkel Sand-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/berkel-sand-claystone-member.