Formal (Van Adrichem Boogaert & Kouwe 1994).
Sequence of sandstones, siltstones and claystones. Composed of basal, fine-grained, light-coloured sandstone, grading laterally and vertically into red to green clay-siltstones in the basin or fine-grained, cemented sandstones in the basin fringe.
Definition of lower boundary
Base of the massive basal sandstone, which forms a subtle unconformity.
Definition of upper boundary
Base of the Detfurth Formation or, on the swells, at the base of the Solling Formation of the Upper Germanic Trias Group. The upper boundary may be difficult to identify in cases where the uppermost sandy part of the Volpriehausen is directly overlain by either the Detfurth or the Solling formations.
Up to 200 m in the lows and controlled to a great extent by intra-Triassic erosion. It reaches 100 m in the Ems Low and 150 m in the Roer Valley Graben. In well K15-FB-108 a section of 411 m is found.
UK: Bunter Sandstone Formation; GER: Volpriehausen Formation; BEL: Volpriehausen Formation.
Origin of name
New formation name, derived from the German stratigraphic nomenclature.
Comprises the Volpriehausen Sandstone and Clay-Siltstone members, and their basin-fringe equivalents, which were formerly assigned to the now abandoned Middle Bunter Formation of NAM and RGD (1980).
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.
TNO-GDN ([YEAR]). Volpriehausen Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/volpriehausen-formation.