Berkel Sandstone Member KNNSB

 

Premise Definition extended after NAM and RGD (1980) . 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)
  Location N 51°57’54.1
E 04°28’03.0
  Depth 1483 to 1566 m
  Length 83 m along hole
Definition Sandstone, light-grey, very fine- to fine- and medium- to coarse-grained, locally gravelly, lignitic, locally glauconitic or with sideritic concretions. Especially in the upper part of the member calcareous cemented beds are common; locally shells and shell fragments are present. Cored sections show high- and low-angle cross bedding and horizontal bedding. Thin intercalated claystone beds are frequently observed, especially near the top. Further into the basin the member becomes increasingly calcareous.
Upper Boundary The upper boundary, with the Vlieland Claystone Formation generally is sharp.
Lower Boundary The lower boundary, with the Berkel Sand-Claystone Member, is gradational, but normally placed at the base of the first massive, clean and porous sand.
Correlation The Vlieland Claystone Formation also is a lateral equivalent to the north and west.
Distribution West Netherlands Basin. The member is well-developed along the southern basin margin. In more basinward areas (P and Q quadrants) a laterally equivalent, thin sandy bed can be recognised within the Vlieland Clay-stone Formation, which can informally be referred to as Berkel Clastic member (KNNSD). In NAM and RGD (1980) this name was suggested as a solution for wells where the Berkel Sandstone Member and the Berkel Sand-Claystone Member could not be separated.
Age Late Hauterivian to mid-Barremian. Characteristic dinocysts recorded are: Pseudoceratium pelliferum, Gardo-dinium trabeculosa and Odontochitina operculata.
Depositional Setting A shallow-marine depositional setting is concluded for the lower parts of these deposits, associated with the upper-shoreface to backshore of a regressive coastal-barrier system prograding to the west and northwest. The upper part of the member was deposited as rework-ed and bioturbated shallow-marine transgressive sands.
Sequence Stratigraphy Progradational sandstone unit, representing the High-stand systems tract of sequences LZB 3.2 and 3.3, and the Transgressive systems tract of LZB 3.4. In the type area the member represents most of the Highstand systems tract of sequence LZB 3.3, but in a basinward (northwesterly) direction, only the later parts of that systems tract are developed as such. To the south sequence LZB 3.2 also becomes involved.
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].