Veldhoven Clay Member NMVFO


Premise Original definition by NAM and RGD (1980) . To distinguish the member from the Veldhoven Formation the affix ‘clay’ has been retained. In the Belgian nomenclature this unit is called the Veldhoven Member of the Voort Formation Marechal and Laga (1988) .
Derivatio nominis Named after the Dutch municipality of Veldhoven, in the province of Noord-Brabant.
Type section Location map See figure (pdf)
  Well Veldhoven-1 (pdf)
  Location N 51°26'20.8
E 05°21'37.2
  Depth 935 to 1047 m
  Length 112 m along hole
  Reference (amended after NAM and RGD (1980) ).
Additional section Location map See figure (pdf)
  Well Asten-1 (pdf)
  Location N 51°23'47.7
E 05°47'27.3
  Depth 952 to 1088 m
  Length 136 m along hole
  Reference amended after NAM and RGD (1980) .
  Well Broekhuizenvorst 52E/114 (pdf)
  Location N 51°30'41.3
E 06°09'12.8
  Depth 244 to 246 m
  Length 2 m along hole
  Well Doornspijk-2 (pdf)
  Location N 52°24'36.2
E 05°46'15.6
  Depth 619 to 715 m
  Length 96 m along hole
  Reference NAM and RGD (1980) .
Definition It consists of grey to greenish grey clays, locally with brownish colours. The member becomes more silty and sandy towards the top. The Veldhoven Clay Member is most typically developed in the Roer Valley Graben. On the Peel and Venlo Blocks it is only a thin clay layer between the Voort and Someren Members.
Upper Boundary In the Roer Valley Graben and on the Peel and the Venlo Blocks it is overlain conformably by the Someren Member. Elsewhere it is unconformably overlain by the Breda Formation.
Lower Boundary The member conformably or mildly unconformably overlies the Voort Member in its southern distribution area. Where the Voort Member is absent, the Veldhoven Clay Member can be distinguished from the underlying Rupel Clay Member by the higher silt content in the upper part of latter, expressed on the gamma-ray log by a lower reading. Furthermore, the Rupel Clay Member shows a typical brownish colour, whereas the Veldhoven Clay Member exhibits greenish-grey aspects.
Distribution Present in the central and southeastern Netherlands, in local fault-bounded depressions, and in the very northeastern end of the Dutch part of the continental shelf.
Age Biostratigraphic control is poor. The lower part of the member is Chattian in age and yields an NP 25 flora. the main part of the sediments does not contain stratigraphically significant calcareous fossils. It is presumably deposited during the earliest Miocene (Aquitanian, NN 1-2). In Germany, sediments that occupy a similar stratigraphic position, i.e. in between the NP 25 and NN 3-5 zones, have tentatively been placed in the NN 1-2 interval (Cˇepek et al., 1988). The foraminiferal fauna contains species characteristic for the FE2-Subzone. The associations, however, are poor. In the lowermost part of the member agglutinated species may prevail.
Depositional Setting The Veldhoven Clay Member has been deposited in an inner-neritic environment. Intervals with high abundance of agglutinated species may have been deposited in deeper water.
Sequence Stratigraphy In the Roer Valley Graben the member is considered to cover the Transgressive tract of sequence TB 1.4 to the Highstand tract of sequence TB 1.5. The boundary between these sequences could not be identified.
References See References Tertiary

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