Main Claystone Member RBSHM


Premise Definition amended after NAM and RGD (1980) . The uppermost interval of the Basal Buntsandstein Member of NAM and RGD (1980) is now placed in the Main Claystone Member.
Type section Location map See figure (pdf)
  Well Blijham-1 (pdf)
  Location N 53°05’40.9
E 07°04’40.0
  Depth 3066 to 3255 m
  Length 189 m along hole
  Reference (amended after NAM and RGD (1980) )
Additional section Location map See figure (pdf)
  Well Buurmalsen-1 (pdf)
  Location N 51°54’18.7
E 05°18’49.2
  Depth 1732 to 1973 m
  Length 241 m along hole
Definition The member consists of a succession of red-brown to green silty, sometimes anhydritic claystones. Some thin sandstone beds and oolitic beds also occur. The base is characterized by a, generally thin, sandstone bed which overlies the Zechstein fines. The apparent monotonous expression on the gamma-ray log reveals, when closely studied, stacking of small-scale fining-upward cycles (see Röling (1991) ). These cycles can be correlated over large distances in the Permo-Triassic Basin. Towards the fringe area the cycles contain an increasing percentage of sand. The boundary with the Rogenstein Member is placed at the base of the first prominent oolite bed. In the southern part of the country, in the Roer Valley Graben, the member passes laterally into the predominantly sandy Nederweert Sandstone Member.
References See References Triassic

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