|Premise||Definition extended after NAM and RGD (1980) . For the sake of purity the lithological affix has been changed from ’Sand-Shale’ to ’Sand-Claystone’. The Berkel Sandstone Member in the Berkel Schiebroek-2 type section has a more limited vertical extent than originally designated in NAM and RGD (1980) . A reinterpretation is given.|
|Derivatio nominis||Named after the village of Berkel near Rotterdam.|
|Type section||Location map||See figure (pdf)|
|Well||Berkel Schiebroek-2 (pdf)|
|Depth||1566 to 1695 m|
|Length||129 m along hole|
|Definition||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.|
|Upper Boundary||The upper boundary, with the Berkel Sandstone Member, is gradational, but normally taken at the base of the first massive, clean and porous sand.|
|Lower Boundary||The lower boundary, with the Rijswijk Member is sharp, and placed at the top of the massive marine sand.|
|Distribution||West Netherlands Basin, onshore area, especially around the Berkel oil field. The Vlieland Claystone beneath the informal Berkel Clastic mb. can also be referred to as Berkel Sand/Claystone Member. The Vlieland Claystone Formation and the Rijn Member (in part) are lateral equivalents to the north and west. To the south and east (Rotterdam-1, Nieuwerkerk-1) the member grades into the Nieuwerkerk Formation|
|Age||Late Hauterivian to Early Barremian. As this unit is the lateral equivalent of the Berkel Sandstone, its palynological association has a similar composition, and the top especially will be diachronous.|
|Depositional Setting||A shallow-marine (lower-shoreface) depositional environment is concluded for these deposits, associated with the foreshore to upper-shoreface of a coastal-barrier system (Berkel Sandstone Member) prograding to the west and northwest.|
|Sequence Stratigraphy||Sequence LZB 3.2 Transgressive to early Highstand systems tract of sequence LZB 3.3 in the Berkel oil field area. To the north and west, the late Highstand is also devel-oped as Berkel Sand/Claystone Member South of the oil field the member becomes restricted to sequence LZB 3.2, Late Transgressive to Early Highstand systems tract.|
|References||See References Upper Jurassic/ Lower Cretaceous|
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].