Formal (Van Adrichem Boogaert & Kouwe 1995).
Comprising cyclic successions of predominantly fine-grained siliciclastic deposits devoid of coal seams. In the northwestern offshore the subgroup locally includes a sandstone-dominated succession.
Delta sedimentation in a lacustrine basin with frequent marine incursions.
Long-term regression from north to south.
Definition of lower boundary
Definition of upper boundary
UK: Millstone Grit Group; GER: Ruhr-Group?; BEL: Belgian Coal Measures Group.
Serpukhovian - Bashkirian.
Origin of name
Named after the small river Geul in the south of the province of Limburg and adjoining Belgium, where some outcrops of this subgroup can be found.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1995. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section C, Silesian. Mededelingen Rijks Geologische Dienst, 50, 1-40.
TNO-GDN ([YEAR]). Geul Subgroup. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/geul-subgroup.