Friesland Member KNNSF


Premise Member defined by van Adrichem Boogaert & Kouwe (1993). This new member has been created to accommodate the sandstones that were previously contained in the former Vlieland Sandstone Member (of NAM and RGD (1980) ). This mainly includes the occurrences on the Friesland Platform and in the Vlieland Basin (see pdf) , the southern Central Graben-Terschelling Basin (see pdf) , and the fringes of the Lower Saxony Basin and Groningen High. The occurrences in the Vlieland Basin (see pdf) have been described by Cottençon et al (1975) and Herngreen, Smit and Wong (1991) .
Derivatio nominis Named after the province of Friesland in the north of the Netherlands.
Type section Location map See figure (pdf)
  Well Vlieland Oost-1 (pdf)
  Location N 53°17’22.2
E 05°04’17.6
  Depth 2200 to 2246 m
  Length 46 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well F18-02 (pdf)
  Location N 54°04’25.3
E 04°43’48.7
  Depth 2035 to 2042 m
  Length 7 m along hole
  Well Slenk-1 (pdf)
  Location N 53°13’48.0
E 05°17’42.3
  Depth 2102 to 2211 m
  Length 109 m along hole
Definition Mainly consists of fine- to medium-grained argillaceous, glauconitic sandstones, although locally grading into conglomeratic sandstones. Bioturbation, mica, shell fragments and lignite particles are often present. Frequently displays an internal coarsening-upward sequence, or a succession of such sequences Cottençon et al (1975) . Locally, relatively thin claystone intercalations are present.
Upper Boundary The conformable contact with the Vlieland Claystone Formation forms the top.
Lower Boundary The Friesland Member conformably to mildly unconformably overlies sediments of the Schieland Group or the Scruff Group, or the Zuidwal Volcanics Formation in the Central Graben, Terschelling Basin (see pdf) and Vlieland Basin (see pdf) . The lower boundary of the formation is generally sharply defined. The member onlaps onto the Friesland Platform, Noord-Holland Platform/Central Netherlands Basin, Groningen High, Texel-IJsselmeer High (see pdf) , and can unconformably rest on much older deposits (Triassic, Permian, Carboni-ferous).
Distribution Vlieland Basin (see pdf) , southern Dutch Central Graben, Terschelling Basin (see pdf) , fringes of Lower Saxony Basin, Friesland Platform, Groningen High, Noord-Holland Platform/ Central Netherlands Basin, Texel-IJsselmeer High (see pdf) . The member shales out towards the north into the Vlieland Claystone Formation.
Age Latest Ryazanian(?)/Early Valanginian in the Vlieland Basin (see pdf) and Terschelling Basin (see pdf) . The earliest deposits in the Vlieland Basin (see pdf) (immediately around Zuidwal) contain Dingodinium spinosum, Egmontodinium torynum, Gochteodinia villosa multifurcata, Gonyaulacysta sp., Kleithriasphaeridium spp., Muderongia simplex microperforata, Pseudoceratium pelliferum, Tehamadinium daveyi (Egmontodinium torynum-zone, Herngreen, Smit and Wong (1991) ). Outside this area the base Vlieland Sand-stone Formation is found in the Early Valanginian (Tubotu-berella apatela-zone), as is the transition to the Vlieland Claystone Formation. The agglutinated foraminifer Ammovertella cellensis is of stratigraphical importance. Due to gradual onlap, it age can be Late Valanginian/ Hauterivian to Barremian on the Friesland Platform, Gro-ningen High, Noord-Holland Platform/Central Nether-lands Basin and Texel-IJsselmeer High (see pdf) .
Depositional Setting The majority of the sands in this member have been deposited as basal transgressive sands, which were intensely reworked by bioturbation, waves, storms, and some tides, or in prograding coastal-barrier systems or offshore shoals. Sponge spicules and glauconite are considered indicative for an open-marine, while coarse clasts and lignitic matter point to a more proximal coast-al setting. Intercalated fines can show either an open-marine, or a lagoonal character.
Sequence Stratigraphy The Friesland Member reflects the Lowstand and Trans-gressive systems tracts of Haq (1988) ’s sequences LZB 2.1 and LZB 2.2 in the Vlieland Basin (see pdf) and Terschelling Basin (see pdf) . On the other structural elements the member can represent the Transgressive systems tracts of up to sequence LZB 3.4.
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].