Veldhoven Formation NMVF

 

Premise Original definition by NAM and RGD (1980) . Amended to include a coarsening-upward sequence previously considered part of the Breda Formation. The position of the lower boundary is amended as well to include a clay layer underlying the basal sands. In Belgium, where this unit occurs in a predominantly sandy development, it is known as 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 860 to 1103 m
  Length 243 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 867 to 1300 m
  Length 433 m along hole
  Well Broekhuizenvorst 52E/114 (pdf)
  Location N 51°30'41.3
E 06°09'12.8
  Depth 223 to 410.5 m
  Length 187.5 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 The Veldhoven Formation is developed most typically in the Roer Valley Graben. It comprises a predominantly sandy unit followed by a grey clay unit that coarsens upward into sands. On the Peel Block and the Venlo Block, the formation consists predominantly of sands. There, it is difficult to discriminate between the Voort and Someren members without the help of biostratigraphic data. Outside the Roer Valley Graben and the adjacent blocks, the formation consists of clays and silty clays with silty to sandy intervals at the base and in the middle part.
Upper Boundary It is overlain by the Breda Formation. from which it is separated by a distinct unconformity, except presumably in the axial area of the Roer Valley Graben.
Lower Boundary The formation in the southern Netherlands conformably or mildly unconformably overlies the Steensel Member of the Rupel Formation. The boundary is sharp and has been defined at the base of a distinct clay layer. Wherever the Steensel Member is missing, the formation mildly unconformably overlies the Rupel Clay Member.
Distribution Mainly restricted to an area centred around the Roer Valley Graben extending northward to include the southeastern part of the Zuiderzee Low. Outside this area found in minor fault-bounded depressions van den Berg and Gaemers (1993) , and in the very northeastern part of the Dutch part of the continental shelf Letsch and Sissingh (1983) . In large parts of the Netherlands the formation is absent as a result of Early Miocene erosion.
Age Chattian, possibly Aquitanian at least where the hiatus with the overlying Breda Formation is small or absent. The foraminiferal faunas are characteristic of the FE2 and FE3 Subzones. The predominantly sandy lower half of the formation yields NP 24 - NP 25 nannofloras. Age control is poor in the clays and the sands in the upper part of the formation. The upper interval does not yield stratigraphically useful nannoplankton species. In Germany, sediments with a similar nannoflora and a comparable stratigraphic position have tentatively been placed in the NN 1-2 interval (Spek et al. 1988).
Depositional Setting Shallow-marine, coarse-grained sediments are restricted to the blocks of the Roer Valley Graben system. The larger part of the clays has been deposited in an inner to outer neritic environment.
Sequence Stratigraphy The Veldhoven Formation represents the time interval covered by Haq (1988) ’s sequences TB 1.1 - TB 1.5. The architecture of the member is intimately connected with the tectonic history of the Roer Valley Graben and the Lower Rhine Embayment (see Zagwijn, 1989). Coarse-grained sediments deposited during late Highstands and possibly Lowstands are only present in the Roer Valley Graben and adjacent blocks. Equivalent sediments are lacking elsewhere, where the flooding surfaces are represented by thin glauconite-rich layers.
Subdivision  
  In the type area two predominantly sandy members separated by an argillaceous unit have been distinguished:
  NMVF Veldhoven Formation
  NMVFS Someren Member
  NMVFO Veldhoven Clay Member
  NMVFV Voort Formation
  North of the type area, first the sands of the Someren Member wedge out, then those of the Voort Member.
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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