Gildehaus Sandstone Member KNNSG


Premise Definition extended after NAM and RGD (1980) . A new reference section is added which shows a thicker devel-opment.
Derivatio nominis Named after the village of Gildehaus in Germany, in the area of Niedersachsen.
Type section Location map See figure (pdf)
  Well Westerbork-1 (pdf)
  Location N 52°46’08.0
E 06°36’54.1
  Depth 1084 to 1091 m
  Length 7 m along hole
  Reference NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well Sleen Dommerskanaal-1 (pdf)
  Location N 52°41’39.7
E 06°52’49.8
  Depth 1411.5 to 1471.5 m
  Length 60 m along hole
Definition Chiefly consists of coarse-grained to conglomeratic sandstones with pebbles of quartz, sandstone and limestone. It frequently contains clay flakes, clay-ironstones and some coals embedded in an argillaceous, very glauconitic sandstone. Medium-grained sandstones, often with a high content of calcareous cement, occur as well, and grade locally into lime-sandstones. In some localities a high content of sponge spicules is characteristic.
Upper Boundary It is (mildly un-) conformably overlain by the main Vlieland Claystone. It can also be unconformably overlain by the Holland Formation
Lower Boundary It conformably covers the Westerbork Member of that formation
Distribution Restricted to the southern Dutch Lower Saxony Basin, i.e. the eastern parts of the provinces Drente and Over-ijssel. This member is less widespread than the Bentheim Sandstone Member. The member is the lateral equivalent of the Vlieland Claystone Formation to the north and east.
Age Palaeontological data indicate a Late Hauterivian age for this member (e.g. occurrence of sporomorphs Foveotriletes foveolatus, Concavissimisporites verrucosus, foraminifers Citharina harpa, Marsonella kummi, Margulinopsis foeda, Epistomina ornata).
Depositional Setting Deposited in an inner- to middle-neritic, locally coastal, setting, in prograding offshore-shoals and coastal-barrier systems. Sponge spicules and glauconite are considered indicative for an open-marine setting, while coarser clasts and lignite point to a more proximal, coastal setting. The majority of the sands in this member seems to have been formed as basal transgressive sands, which were intensely reworked by waves, storms, and some tides.
Sequence Stratigraphy Highstand systems tract of sequence LZB 2.5 to Early Transgressive systems tract of sequence LZB 3.2.
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].