Central Graben Subgroup

Code
SLC
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1993).
Lithological description

Mainly non-marine sediments consisting of variegated claystones, silty to clayey sandstones and distinct coal layers or calcareous intercalations are locally present.

Depositional setting

Mostly non-marine coastal to delta plain deposits, with intermittent marine sediments, deposited during transgressions.

Definition of lower boundary

Unconformable on the marine claystones of the Lower to Middle Jurassic Altena Group, or even on older Lower and Upper Germanic Trias and Zechstein groups.

Definition of upper boundary

Conformably overlain by the marine Scruff Group. In the centre of the Dutch Central Graben however, the Rijnland Group or younger groups unconformably rests on this group, if a prominent Late Kimmerian II unconformity is developed.

Thickness indication
Up to 500 m (F14-04).
Geographical distribution
Regional correlation
UK: Humber Group; GER: ?; BEL: -.
Age
Callovian - Tithonian.
Holostratotype
Depth (thickness) AH:
2547 - 3652 m (1105 m)
Hypostratotype
Depth (thickness) AH:
2422 - 2686 m (264 m)
Origin of name
Named after the Central Graben in the northern Dutch offshore.
Previous name(s)
None.
Reviewed by (date)
Sander Houben (2017).
References
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
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]). Central Graben Subgroup. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/central-graben-subgroup.