Lower Werkendam Member ATWDL

 

Premise Definition after NAM and RGD (1980)
Derivatio nominis .
Type section Location map See figure (pdf)
  Well Werkendam-2 (pdf)
  Location N 51°47’29.7
E 04°50’22.1
  Depth 2007 to 2205 m
  Length 198 m along hole
  Reference NAM and RGD (1980)
Definition A grey, occasionally silty, claystone sequence, often containing characteristic clay-ironstone concretions and/or iron ooliths. Its base rests upon the bituminous claystones of the Posidonia Shale Formation and its top is defined by the first of the more calcareous, silty to sandy beds of the overlying Middle Werkendam Member.
References See References Lower and Middle Jurassic

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].