Code
KNNSK
Status
Formal (Van Adrichem Boogaert & Kouwe 1993).
Lithologische beschrijving
Massive sequence of fine- to medium-grained, locally coarse-grained sandstones, generally light-grey, well-sorted with sub-angular to rounded grains, moderately cemented, both bioturbated and stratified. The sandstones locally contain streaks of heavy mineral sand, coal laminae and pyrite particles.
Afzettingsmilieu
The sandstones were deposited as barrier sands.
Definitie ondergrens
Stratigraphically rests slightly unconformably on the Breeveertien Formation, which also forms its lateral equivalent to the south and east.
Definitie bovengrens
In the north-west, conformably overlain by the Vlieland Claystone Formation.
Dikte indicatie
50 - 100 m.
Geografische verbreiding
Regionale correlatie
UK: Valhall Formation; GER: ~Minden-Braunschweig-Gruppe; BEL: -.
Ouderdom
latest Berriasian - middle Valanginian.
Holostratotype
Well:
Depth (thickness) AH:
1743 - 1905 m (162 m)
Parastratotype
Well:
Depth (thickness) AH:
1801 - 1859 m (58 m)
Parastratotype
Well:
Depth (thickness) AH:
1962 - 2074 m (112 m)
Parastratotype
Well:
Depth (thickness) AH:
2100 - 2150 m (50 m)
Oorsprong naam
Named after the Kotter oil field, located in the Broad Fourteens Basin (block K18a).
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]). Kotter Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/kotter-member.