Hardegsen Formation RBMH


Premise Comprises the slightly amended Hardegsen Member of NAM and RGD (1980) and its equivalent in the former Middle Bunter Formation. New ideas on the recognition of the Solling Formation have led to a reinterpretation of the type well.
Derivatio nominis Name derived from the German stratigraphic nomenclature (Hardegsen Folge: Boigk (1959) ; Röling (1991) ).
Type section Location map See figure (pdf)
  Well L02-01 (pdf)
  Location N 53°57’14.0
E 04°30’47.0
  Depth 3970 to 4009 m
  Length 39 m along hole
  Reference (amended after NAM and RGD (1980)
Additional section Location map See figure (pdf)
  Well Blijham-1 (pdf)
  Location N 53°05’40.9
E 07°04’40.0
  Depth 2736 to 2748 m
  Length 12 m along hole
  Well Buurmalsen-1 (pdf)
  Location N 51°54’18.7
E 05°18’49.2
  Depth 1387 to 1401 m
  Length 14 m along hole
  Well Strijen West-1 (pdf)
  Location N 51°44’41.0
E 04°31’14.3
  Depth 2535 to 2553 m
  Length 18 m along hole
  Reference (amended after NAM and RGD (1980)
Definition Uptriasost cycle of the Main Buntsandstein, comprising several stacked alternations of off-white to pink sandstones and red claystones. The regular alternation of these lithologies is typical for the member. In the southern Netherlands onshore and offshore the member is predominantly composed of arkosic sandstones without claystone intercalations.
Upper Boundary The Hardegsen Formation comprises the strata between the Detfurth and the Solling Formation. The upper boundary is formed by the base of the Upper GermanicTrias Group (Base Solling Unconformity or Spathian Unconformity).
Lower Boundary The lower boundary has been placed at the base of the first sandstone bed above the Detfurth Formation.
Distribution Owing to truncation at the Base Solling Unconformity, the formation occurs only in the centres of the West Netherlands Basin, the Roer Valley Graben, the Off Holland Low, the Ems Low and the Central Graben. Its occurrence in the eastern parts of the Netherlands is very restricted. In the southern parts of the Netherlands onshore and adjoining offshore it has a wider distribution, particularly in the West Netherlands Basin and the Roer Valley Graben (see Table E.1 (see pdf) ).
Age Scythian.
Subdivision The member was formerly subdivided into a basal sandstone with an overlying claystone NAM and RGD (1980) .; it is, however, not advisable to apply this subdivision, because well data and literature R�ng (1991) demonstrate that several such alternations were originally present in the Hardegsen Formation, and a variable number of these may have been only preserved locally below the Base Solling Unconformity.
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].