Kotter Member

Formal (Van Adrichem Boogaert & Kouwe 1993).
Lithological description

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.

Depositional setting

The sandstones were deposited as barrier sands.

Definition of lower boundary

Stratigraphically rests slightly unconformably on the Breeveertien Formation, which also forms its lateral equivalent to the south and east.

Definition of upper boundary

In the north-west, conformably overlain by the Vlieland Claystone Formation.

Thickness indication
50 - 100 m.
Geographical distribution
Regional correlation
UK: Valhall Formation; GER: ~Minden-Braunschweig-Gruppe; BEL: -.
latest Berriasian - middle Valanginian.
Depth (thickness) AH:
1743 - 1905 m (162 m)
Depth (thickness) AH:
1801 - 1859 m (58 m)
Depth (thickness) AH:
1962 - 2074 m (112 m)
Depth (thickness) AH:
2100 - 2150 m (50 m)
Origin of name
Named after the Kotter oil field, located in the Broad Fourteens Basin (block K18a).
Previous name(s)
Reviewed by (date)
Sander Houben (2017).
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.