Code
SK
Status
Formal (NAM & RGD 1980). The SK-Group, SG-Group and SL-Group can be taken together as Upper Jurassic Supergroup (code S).
Lithologische beschrijving
Group of formations with a predominantly clayey lithology, but also including limestones and evaporites in the lower part. Sands and conglomerates are restricted to the basin fringe.
Afzettingsmilieu
Fresh- to brackish-water lacustrine basin with intermittent marine and hypersaline periods. Hypersaline sediments dominate the Weiteveen Formation.
Definitie ondergrens
Unconformably on the Altena Group (or older sediments).
Definitie bovengrens
Unconformably overlain by the (sands or clays of the) Rijnland Group.
Dikte indicatie
100 - 250 m (up to 600 m in SE Drente).
Geografische verbreiding
Regionale correlatie
UK: ?; GER: ?; BEL: -.
Ouderdom
middle Kimmeridgian-Berriasian / early Valanginian.
Holostratotype
Depth (thickness) AH:
944 - 1590 m (646 m)
Parastratotype
Well:
Depth (thickness) AH:
994 - 1196 m (202 m)
Parastratotype
Depth (thickness) AH:
1644 - 1718 m (74 m)
Parastratotype
Well:
Depth (thickness) AH:
1109.5 - 1344 m (234.5 m)
Parastratotype
Well:
Depth (thickness) AH:
114 - 588 m (474 m)
Oorsprong naam
Named after the German area of Niedersachsen (= Lower Saxony).
Vorige benaming(en)
None.
Gereviewed door (datum)
Sander Houben (2017).
Referenties
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Cite as
TNO-GDN ([YEAR]). Niedersachsen Group. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/niedersachsen-group.