Santpoort Member SLDBS


Premise Member defined by van Adrichem Boogaert & Kouwe (1993). Originally referred to informally by Conoco as the ’Middle Delfland Sandstone Member’.
Derivatio nominis Named after the town of Santpoort, in the south of the Dutch province of Noord-Holland. It lies approximately on strike projection from the offshore type locality.
Type section Location map See figure (pdf)
  Well K18-Kotter-07A (pdf)
  Location N 53°04’56.1
E 03°57’56.8
  Depth 2403 to 2571 m
  Length 168 m along hole
  Reference 148 m TVD
Definition Sequence of white to light-grey, fine- to medium-grained sandstones alternating with siltstones and claystones, and traces of coaly matter.
Upper Boundary The member is conformably overlain by the claystones of the Driehuis Mottled Claystone Member, or it is unconform-ably overlain by younger sediments.
Lower Boundary Conformably overlies claystones of the Fourteens Claystone Member. Locally, seismic evidence of a slight unconformity (onlapping) is observed at the base of this member. Reworking of palynomorphs supports this.
Distribution Restricted to the eastern part of block K18, where sheet and channel sands are developed best. Missing as a result of shaling out in for instance Q01 and K15. Sediments of the Santpoort Member appear to exhibit pronounced lateral facies changes, hampering identification and regional correlation. The sequence shales out into blocks Q01 and K15.
Age Portlandian. In situ fauna/flora poor, in content similar to the Driehuis Mottled Member, sometimes with some reworking of Early Kimmeridgian forms. The base of the member is situated well above the last abundant occurrence of Geiselodinium paeminosum, while the top of the member is characterised by a marked incursion of Cribroperidinium spp.
Depositional Setting The sediments were deposited in a lower-coastal-plain to fluvial-plain setting. Marine influence is indicated by the continued occurrence of low-diversity dinoflagellate associations.
Sequence Stratigraphy The deposition of the Santpoort Member is considered to equate to sequences LZB 1.1 and LZB 1.2.
References See References Upper Jurassic/ Lower Cretaceous

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