Formal (Van Adrichem Boogaert & Kouwe 1993). The SK-Group, SG-Group and SL-Group can be taken together as Upper Jurassic Supergroup (code S).
Grey and variegated claystones, coaly to clayey sandstones, rare coal seams, and locally calcareous intercalations.
Paralic to continental environment, but some restricted-marine (lagoonal) intercalations occur, especially around the boundaries with adjoining marine units.
Definition of lower boundary
In the major part of the Jurassic basins it unconformably overlies the Altena Group. On elevated blocks, and outside these basins, the group may rest on deposits of Triassic or Permian age.
Definition of upper boundary
More or less conformably overlain by the Scruff Group in the southern Dutch Central Graben and Terschelling Basin. Elsewhere the Rijnland Group conformably, or locally unconformably covers this group, except in strongly inverted areas, where the Chalk Group or Lower North Sea Group unconformably rests on this group.
UK: Humber Group; GER: ?; BEL: -.
middle Callovian - Barremian.
Origin of name
Named after the polder authority of Schieland, in the heart of the province of Zuid Holland, between the cities of Gouda and Delft.
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]). Schieland Group. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/schieland-group.