Detfurth Formation RBMD

 

Premise Formation defined by van Adrichem Boogaert & Kouwe (1994).
Derivatio nominis New formation name, derived form the German stratigraphic nomenclature (Detfurth-Folge: Boigk (1959) ; Röhling (1991) ). It comprises the former Detfurth Sand-stone and Detfurth Claystone Members and their equivalents in the Middle Bunter Formation as defined by NAM and RGD (1980) .
Type section Location map See figure (pdf)
  Well L02-01 (pdf)
  Location N 53°57’14.0
E 04°30’47.0
  Depth 4009 to 4048 m
  Length 39 m along hole
Additional section Location map See figure (pdf)
  Well Blijham-1 (pdf)
  Location N 53°05’40.9
E 07°04’40.0
  Depth 2748 to 2807 m
  Length 59 m along hole
  Well Buurmalsen-1 (pdf)
  Location N 51°54’18.7
E 05°18’49.2
  Depth 1401 to 1427 m
  Length 26 m along hole
  Well Strijen West-1 (pdf)
  Location N 51°44’41.0
E 04°31’14.3
  Depth 2553 to 2589 m
  Length 36 m along hole
Definition Sandstone-claystone couplet, composed of a lower sandstone and overlying claystone interval, grading laterally into massive sandstones in the basin-fringe area. The sandstone is light in colour and contains a high percentage of quartz. The claystone is red-brown.
Upper Boundary The Detfurth Formation comprises the strata between the Volpriehausen and the Hardegsen Formations. The upper boundary has been placed at the base of the first sandstone bed of the Hardegsen Formation or, near the swells, at the base of the unconformably overlying Solling Formation of the Upper Germanic Trias Group. In the basin-fringe area, this boundary is placed at the top of the uppermost of the claystone beds that occur in the upper part of the formation.
Lower Boundary The lower boundary has been defined at the base of the sandstone, which forms a subtle unconformity, especially recognisable on the flanks of the Triassic highs (the ‘D’-Unconformity of Trusheim (1961) ; see also Geluk et R�ng (1995) ). In the fringe area this sandstone is distinguished from the underlying Volpriehausen Formation by lower gamma-ray readings and a lower acoustic veloci.
Distribution The Detfurth Formation has a more limited distribution than the Volpriehausen Formation, owing to truncation at the Base Solling Unconformity; its occurrence is restricted to Triassic lows such as the West Netherlands Basin, the Roer Valley Graben, the Off Holland Low, the Ems Low and the Central Graben (Fig. A.5 in Section A).
Age Scythian.
Subdivision  
  The formation has been subdivided in the basinal area as follows:
  RB Lower Germanic Trias Group
  RBM Main Buntsandstein Subgroup
  RBMD Detfurth Formation
  RBMDC Detfurth Claystone Member
  RBMDL Lower Detfurth Sandstone Member
  In the basin-fringe area (southern Netherlands onshore and adjacent offshore) the formation has been subdivided into:
  RBMDU Upper Detfurth Sandstone Member
  RBMDL Lower Detfurth Sandstone Member
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].