Röt Formation

Code
RNRO
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1994).
Lithological description

Lower: evaporites with anhydritic claystones, anhydrite and rock-salt. Upper: dominated by red-brown to greenish clay- and siltstones. Basin-fringe area: claystones, sandstones and some thin anhydrite beds.

Depositional setting

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

Definition of lower boundary

Base of the main evaporite. In the western and southern Netherlands offshore and adjoining onshore, these evaporites grade locally into sandstones. In the West Netherlands Basin, where the evaporites did not develop, this transition may be difficult to identify. lf it is not possible to distinguish the underlying Solling Claystone Member separately, the Röt Formation may be lumped with the Solling Claystone Member into an informal unit: the upper Bunter unit (RNUB).

Definition of upper boundary

Placed below the first carbonate bed of the Muschelkalk Formation.

Thickness indication
Over 300 m (Dutch Central Graben), less than 50 m (south-western offshore).
Geographical distribution
Regional correlation
UK: Röt Formation; GER: Röt Formation; BEL: Röt Formation.
Age
early Anisian.
Holostratotype
Depth (thickness) AH:
3650 - 3929 m (279 m)
Parastratotype
Well:
BK170074 (K17-02)
Depth (thickness) AH:
1613 - 1761 m (148 m)
Parastratotype
Depth (thickness) AH:
244 - 2447 m (2203 m)
Hypostratotype
Depth (thickness) AH:
2417 - 2524 m (107 m)
Origin of name
Name derived from the German stratigraphic nomenclature, where it is applied as an alternative name for the Upper Buntsandstein.
Previous name(s)
None.
Reviewed by (date)
Johan ten Veen (2017).
References
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-GSN ([YEAR]). Röt Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/rot-formation.