Steensel Member NMRFT

 

Premise Member defined by van Adrichem Boogaert and Kouwe (1997). The member has been created to accommodate the uppermost, sandy part of the Rupel Formation as found near the southeastern margin of the basin. In neighbouring countries sands occur in overall similar stratigraphic positions. In Belgium, the lithostratigraphic equivalent has been named Eigenbilzen Formation Marechal and Laga (1988) .
Derivatio nominis .Named after the village of Steensel in the province of Noord-Brabant, close to the type well.
Type section Location map See figure (pdf)
  Well Veldhoven-1 (pdf)
  Location N 51°26'20.8
E 05°21'37.2
  Depth 1103 to 1122 m
  Length 19 m along hole
  Reference 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 1300 to 1317 m
  Length 17 m along hole
  Well Broekhuizenvorst 52E/114 (pdf)
  Location N 51°30'41.3
E 06°09'12.8
  Depth 410.5 to 416 m
  Length 5.5 m along hole
Definition The member represents the sandy upper part of the Rupel Formation. It comprises an alternation of clays and silty clays with thin sand layers, grading upwards into fine-grained sands with a high glauconite content.
Upper Boundary The Steensel Member is conformably or slightly unconformably overlain by the basal clay layers of the Voort Member of the Veldhoven Formation. Again, in the Roer Valley Graben the transition stands out on log readings.
Lower Boundary The member conformably overlies the Rupel Clay Member. In the Roer Valley Graben, the transition is marked by a decrease in gamma-ray and spontaneous-potential log readings. In the Venlo and Peel blocks, it is less distinct on logs. The lower boundary is gradual and diachronous. Along the basin margin the development of the Steensel Member starts earlier than closer to the basin centre.
Distribution Restricted to the southeastern part of the Netherlands, notably to an area centred around the Roer Valley Graben and the southeastern part of the Zuiderzee Low.
Age Rupelian. The lower boundary lies within the NP 23 and the upper boundary within the NP 24 nannofloral zone. The member contains a microfauna which is indicative of the uppermost part of the FF-Zone.
Depositional Setting Deposited in an inner-neritic environment.
Sequence Stratigraphy The Steensel Member is the time-equivalent of the Highstand part of sequence TA 4.5.
References See References Tertiary

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