Someren Member NMVFS


Premise Member defined by van Adrichem Boogaert and Kouwe (1997). Introduced to accommodate the sands and sandy clays that in the southeastern Netherlands constitute the upper part of the Veldhoven Formation.
Derivatio nominis Named after the village of Someren in the province of Noord-Brabant, in the vicinity of the type well.
Type section Location map See figure (pdf)
  Well Well Asten-1 (pdf)
  Location N 51°23'47.7
E 05°47'27.3
  Depth 867 to 952 m
  Length 85 m along hole
Additional section Location map See figure (pdf)
  Well Veldhoven-1 (pdf)
  Location N 51°26'20.8
E 05°21'37.2
  Depth 860 to 935 m
  Length 75 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 223 to 244 m
  Length 21 m along hole
Definition The member represents the sandy upper part of the Veldhoven Formation. It comprises clayey sands grading upwards into very fine-grained sands. The colour of the sand is greenish-grey and the glauconite content is low. Shells occur locally. The member is only easily recognised in the Roer Valley Graben.
Upper Boundary The Someren Member is overlain by the Breda Formation. The boundary with that unit is formed by an unconformity, except possibly in the Roer Valley Graben. In the graben the upper boundary is marked by a change in pattern of SP-log readings, from rather gradually decreasing values below the boundary, to medium- to high-amplitude variations above it. On the Venlo and Peel Blocks, the transition is expressed on the gamma-ray log as a overall change towards lower readings. The lowermost few metres of the Breda Formation, however, have relatively high gamma-ray readings because of their high glauconite content.
Lower Boundary The member conformably overlies the Veldhoven Clay Member. The transition is gradual. On the Peel Block and the Venlo Block, the Veldhoven Formation consists mainly of sands with only a very thin Veldhoven Clay Member. There, the Someren Member, can only be identified with the help of biostratigraphical data.
Distribution Thought to be preserved only in the Roer Valley Graben and on the Peel and Venlo Blocks, i.e. in down-faulted parts of the basin, close to the input area of coarse-grained clastics.
Age Probably earliest Miocene (Aquitanian, NN 1-2). Age control is poor. The interval does not yield stratigraphically useful nannoplankton species. In Germany, sediments that occupy similar stratigraphic positions, 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 is characterised by the abundant occurrence of Asterigerina guerichi and Florilus boueanus.
Depositional Setting The Someren Member has been deposited in an inner-neritic environment.
Sequence Stratigraphy The Someren Member is considered to be the time equivalent of the Highstands of sequence TB 1.4 and sequence TB 1.5. The boundary between the two sequences, however, 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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