Hollum Member ROCLH

 

Premise Originally defined by NAM and RGD (1980) .
Derivatio nominis Named after the village of Hollum on the Wadden island of Ameland.
Type section Location map See figure (pdf)
  Well Hollum-Ameland-2 (pdf)
  Location N 53°27’27.2
E 05°37’32.1
  Depth 3314 to 3349 m
  Length 35 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well L04-01(A1) (pdf)
  Location N 53°45’02.9
E 04°04’29.4
  Depth 3940 to 3948 m
  Length 8 m along hole
Definition Thin, red-brown clay- and siltstone interval with a few sand-/siltstone stringers.
Upper Boundary This member is conformably overlain by the Lower Slochteren Member. The boundary has been placed at the base of the first prominent sandstone or conglomerate bed. .
Lower Boundary The member rests unconformably on the Limburg Group, consisting of grey, black or secondarily reddened, carbonaceous clay-/siltstones, sandstones and coal seams ( Caumer or Dinkel Subgroups), or of orange-red mudstones and sandstones ( Hunze Subgroup). Generally, the Limburg Group stands out on porosity logs by a higher degree of compaction.
Correlation Where the overlying Lower Slochteren Member grades into the main Silverpit Formation, the Hollum Member can no longer be discerned
Distribution The member is restricted to an area between the transition zone and the centre of the basin, where it is developed as a claystone interval resting on the Limburg Group, overlain by a relatively thin interval of the Lower Slochteren Member.
References See References Permian

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