Lower Rotliegend Group RV


Premise Initially defined as a formation by Stäuble and Milius (1970) . van Adrichem Boogaert (1976) considered it a subgroup of the Rotliegend Group. NAM and RGD (1980) raised it to group level.
  The section in well Marslanden-1, tentatively correlated with the Lower Rotliegend Group by NAM and RGD (1980) , is no longer considered to belong to this group. Instead, this section is referred to the De Lutte Formation of the Limburg Group (Hunze Subgroup) with a volcanic intercalation.
Derivatio nominis Name derived from the German stratigraphic nomenclature, where it is commonly applied for the lower, volcanic part of the Rotliegend.
Type section Location map See figure (pdf)
  Well Emmercompascuum-01 (pdf)

N 52°48'09.9

E 07°03'52.4

  Depth 3935 to 4014 m
  Length 79 m along hole
  Reference Not yet designated because a complete succession comparable with the German development (e.g. Fabian et al (1962) ) has not been demonstrated in the Netherlands.
Definition Sequence of red-brown, siliciclastic sediments and basaltic volcanics, in highly variable proportions.
Upper Boundary The group is dis- or unconformably overlain by the black shales of the Coppershale Member of the Zechstein 1 (Werra) Formation or by the sandstones and red-bed mudstones of the Upper Rotliegend Group, which does not contain volcanics.
Lower Boundary The group disconformably overlies the erosion surface at the top of the Limburg Group. It succeeds mainly fine-grained red beds or coal measures. The lower boundary has been placed at this disconformity, which may be difficult to distinguish in a red-bed succession. The upper boundary is formed by the top of the volcanics.
Distribution In the Netherlands, the Lower Rotliegend Group is known from east-central Drenthe. In this area the Upper Rotliegend Group is absent. In the Central Graben, and in the vicinity of it, both in the British and the German offshore sectors, a succession of interbedded basaltic volcanics and clastics is known to occur between the Upper Carboniferous and the volcanics-free Rotliegend or Zechstein deposits (e.g. a 205 m thick interval in UK well 39/02-01). These rocks are also attributed to the Lower Rotliegend Group. Similar rocks may occur in the Netherlands North Sea sector.
Age Most likely Autunian, by comparison with the German development. The Autunian, a poorly defined age name used in middle Europe for Permian continental deposits is placed in the early part of the Early Permian Odin and Odin (1990) . The volcanites in the lower part of the German Rotliegend (as treated by Gebhardt et al (1991) are, according to Menning (1994) Asselian to Sakmarian in age.
Depositional Setting A succession or alternation of ephemeral fluvial sediments deposited in an arid to semi-arid environment and basaltic lava flows, related to late Hercynian rifting.
  In Germany, adjacent to the Dutch border, the basal, sili-ciclastic part of the group is frequently overlain by volcanic rocks often with clastic intercalations. Hence the subdivision into:
  RV Lower Rotliegend Group
  RVVE Emmen Volcanic Formation
  Basal Rotliegend clastics
  As no unequivoval examples of the lower unit are known in the Netherlands, it is regarded here as an informal unit. It should be noted that the distinction between Basal Rotliegend clastics and similar red clastics that belong to the Hunze Subgroup (Limburg Group) is quite difficult, as is shown in the nearly fully cored Rotliegend interval in the German well Oberlanger Tenge Z1 (Fabian et al (1962) ).
References See References Permian

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