Rot Formation RNRO

 

Lower R�vaporite Member
Premise Definition amended after NAM and RGD (1980) . Part of this formation, the former Solling Member, was been raised to formation status, and the Röt" Formation has been redefined accordingly.
Derivatio nominis Name derived from the German stratigraphic nomenclature, where it is applied as an alternative name for the Upper Buntsandstein.
Type section Location map See figure (pdf)
  Well L02-01 (pdf)
  Location N 53°57’14.0
E 04°30’47.0
  Depth 3650 to 3929 m
  Length 279 m along hole
  Reference amended after NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well K17-01 (pdf)
  Location N 53°02’41.0
E 03°37’06.0
  Depth 1613 to 1761 m
  Length 148 m along hole
  Reference amended after NAM and RGD (1980)
  Well Eleveld-101 (pdf)
  Location N 52°57’27.9
E 06°34’41.9
  Depth 244 to 2447 m
  Length 2203 m along hole
  Reference (amended after NAM and RGD (1980) ).
  Well Strijen West-1 (pdf)
  Location N 51°44’41.0
E 04°31’14.3
  Depth 2417 to 2524 m
  Length 107 m along hole
Definition Sequence of interbedded red-brown to greenish silty, anhydritic claystones, anhydrite and rock-salt. In the basin-fringe area the formation is composed of claystones, sandstones and some thin anhydrite beds.
Upper Boundary The Röt  Formation comprises the strata between the Solling Formation and the Muschelkalk Formation. The upper boundary is placed below the first carbonate bed of the Muschelkalk Formation. Throughout the Dutch subsurface, the carbonate content of the Muschelkalk Formation decreases in northerly and westerly direction, but the boundary between the Röt  and Muschelkalk Formations remains discernable on wireline logs by a lower gamma-ray and a higher sonic velocity response of the latter formation.
Lower Boundary The lower boundary is taken at the 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 boundary may be difficult to identify. If it is not possible to distinguish the underlying Solling Claystone Member separately, the Röt  Formation may be lumped with this member into an informal unit: the Upper Bunter. This unit partly the equivalent of the Upper Bunter Formation of the old nomenclature of NAM and RGD (1980) .
Distribution The formation is recognised in almost the entire distribution area of the Upper Germanic Trias Group.
Age Early Anisian. The oldest Middle Triassic sporomorphs were observed in the Member and R�laystone Member in the eastern Netherlands (Freudenthal (1964) ; Visscher (1966) ; Zwan and Spaak (1992) ; RGD, 1993).
Depositional Setting R�ediments were laid down in a lacustrine, and restricted-marine to evaporitic settings. Fluvial conditions occurred in the basin-fringe area.
Subdivision  
  Two separate subdivisions are applied, a basinal subdivision and a basin-fringe subdivision:
  RN Upper Germanic Trias Group
  RNRO Röt Formation
  Basinal subdivision:
  RNROU Upper R�laystone Member
  RNROM Intermediate R�laystone Member
  RNRO1 Main R�vaporite Member
  The Upper R�vaporite Member wedges out towards the basin-margin. Hence, in the latter area the Upper and Intermediate R�laystones are lumped into Claystone the R�Member.
  The basin fringe shows a different development. Here a sandstone interval is intercalated between two claystone units, hence the following subdivision:
  RNROY Upper R�ringe Claystone Member
  RNROF R�ringe Sandstone Member
  RNROL Lower R�ringe Claystone Member
  This fringe development is equivalent to most of the former Upper Bunter Formation of NAM and RGD ( 1980) . Figure E.3 (see pdf) shows the stratigraphic position of the members in relation to each other.
References See References Triassic

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].