Rijn Member KNNSI

 

Premise Member defined by van Adrichem Boogaert & Kouwe (1993). Consists of the deposits of the Vlieland Sandstone Formation encountered in the western offshore part of the West Netherlands Basin and adjoining highs. Informally called Rijnland Sandstone by Amoco.
Derivatio nominis Named after the Rijn oil field, which produces from this interval in block P15.
Type section Location map See figure (pdf)
  Well P15-RIJN-A-01 (originally P15-03) (pdf)
  Location N 52°17’27.8
E 03°49’03.4
  Depth 1957 to 1986 m
  Length 29 m along hole
  Reference .
Additional section Location map See figure (pdf)
  Well P09-01-A (pdf)
  Location N 52°32’19.4
E 03°44’52.2
  Depth 2052 to 2228 m
  Length 176 m along hole
  Reference .
Definition White to greyish-orange sandstone, very fine-, rarely up to very coarse-grained, slightly calcareous, argillaceous, locally with abundant glauconite and mollusc shells. In general the interval is intensely bioturbated. Typically showing no grain-size trends, or several stacked coarse-ning-upwards trends. Few intercalated thin beds of olive-grey, silty mudstone. On GR logs the member appears as a thick sequence with relatively high readings, resulting from the high clay- and glauconite-content. The member shows con-siderable variations in thickness.
Upper Boundary Both the lower and upper boundaries are well-defined at the base and top of the marine sandstone body. The Rijswijk Member is its more proximal lateral equivalent to the east. The Rijn Member can be recognised by its more open-marine character, free of terrestrial influence. Also, it often is thicker (up to 200 m), more argillaceous (smoother, higher average GR-readings), showing no coarsening- or fining-upwards trends.
Lower Boundary The member unconformably rests upon Triassic or Lower/Middle Jurassic sediments, or upon the lignitic heterolithics of the Delfland Subgroup (Nieuwerkerk or Breeveertien Fms.).
Distribution Roughly coincides with the part of the P quadrant which lies in the West Netherlands Basin (south-western P05, P08-P18) and adjoining highs. The southern part of the Q-quadrant shows a development transitional between the Rijn and Rijswijk Mbs. It is suggested here to assign these occurrences to the Rijswijk Member, but some occurrences of Vlieland Sandstone Formation in blocks Q07, Q10, Q13 and Q14 could also be assigned to the Rijn Member. The main Vlieland Claystone Formation is a lateral equivalent to the north.
Age In the type area mid- to Late Hauterivian. The deposits appear to be somewhat richer in microflora than the Rijswijk Member Typical dinoflagellate forms are Muderongia simplex, Subtilisphaera terrula, Canningia cf. reticulata, and Gonyaulacysta kostromiensis. Microfauna typically includes Epistomina caracolla, Hectina antiqua, and Haplophragmium aequale. In P09, the occurrence of Early Hauterivian in the lower parts of this member is indicated by dino species Meiourogonyaulax pertusa and Isthmocystis distincta. Early Hauterivian to Late Valan-ginian ages are reported in Blocks P05-P06 by Dunay and Dronkers (1983), although mainly on the basis of the overlying Vlieland Claystone Formation
Depositional Setting The sandstones have been deposited as offshore shoal-bars and/or transgressive sheet-sands. The offshore nature of the sands is indicated by the abundance of glauconite, the more common occurrence of microfauna and -flora, and by the absence of features indicating a position near to the coast, such as common lignite.
Sequence Stratigraphy In the type area, this member represents Haq (1988) ’s sequences LZB 2.5-3.1. To the north of the realm, sequences LZB 2.2 to 2.4 can also be developed as this member.
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].