Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1993).
Mainly non-marine sediments consisting of variegated claystones, silty to clayey sandstones and distinct coal layers or calcareous intercalations are locally present.
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.
UK: Humber Group; GER: ?; BEL: -.
Origin of name
Named after the Central Graben in the northern Dutch offshore.
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..
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.