Code
KNNSH
Status
Formal (Van Adrichem Boogaert & Kouwe 1993).
Lithologische beschrijving
Quartz-rich sandstones with minor marine and lagoonal claystone intercalations.
Afzettingsmilieu
Deposited in a shallow-marine, littoral facies. Amalgamated beach bars were formed in a wave-dominated environment.
Definitie ondergrens
Stratigraphically rests on the Helm Member in the centre of the Broad Fourteens Basin. Unconformably covers older Mesozoic to Palaeozoic strata at the basin margins.
Definitie bovengrens
In general overlain by the Vlieland Claystone Formation.
Dikte indicatie
Up to 220 m.
Geografische verbreiding
Regionale correlatie
UK: Valhall Formation; Ger: ~Minden-Braunschweig-Gruppe; BEL: -.
Ouderdom
Valanginian.
Holostratotype
Depth (thickness) AH:
1412 - 1547 m (135 m)
Parastratotype
Well:
Depth (thickness) AH:
1275 - 1347 m (72 m)
Oorsprong naam
Named after the Helder oil field, Block Q01, Dutch off-shore sector.
Vorige benaming(en)
None.
Gereviewed door (datum)
Sander Houben (2017).
Referenties
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..
Cite as
TNO-GDN ([YEAR]). Helder Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/helder-member.