upper Bunter unit

Informal (Van Adrichem Boogaert & Kouwe 1994).
Lithological description

Evaporites with anhydritic claystones, anhydrite and rock-salt; red-brown to greenish clay- and siltstones; claystones, sandstones and some thin anhydrite beds. lf it is not possible to distinguish the Solling Claystone Member from the overlying Röt Formation, these may be lumped into this informal unit.

Depositional setting

Lacustrine, and restricted-marine to evaporitic settings. Fluvial conditions occurred in the basin-fringe area.

Definition of lower boundary

Not yet determined.

Definition of upper boundary

Placed below the first carbonate bed of the Muschelkalk Formation.

Thickness indication
Not yet determined.
Regional correlation
UK: Röt Formation; GER: Röt Formation; BEL: Röt Formation.
late Olenakian - early Anisian.
Origin of name
German origin.
Previous name(s)
Partly the equivalent of the Upper Bunter Formation (NAM & RGD 1980).
Reviewed by (date)
Geert-Jan Vis (2019).
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. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section E, Triassic. Mededelingen Rijks Geologische Dienst, 50, 1-28.
Cite as
TNO-GDN ([YEAR]). upper Bunter unit. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/upper-bunter-unit.