Informal (Van Adrichem Boogaert & Kouwe 1994).
Sandstone. Along the basin margin, where sandy sediments prevail, it may be difficult to distinguish the boundaries between the formations in the Main Buntsandstein Subgroup, and to discern the base of the Solling Formation. This is particularly true for well sections that are studied in isolation. ln such cases it is possible to lump the formations (Volpriehausen, Detfurth and Hardegsen) together with the Basal Solling Sandstone Member into the informal middle Bunter sandstone (RBBM).
Definition of lower boundary
Placed at the base of the lowermost thick sandstone bed. Corresponds to the base of the Main Buntsandstein Subgroup.
Definition of upper boundary
Corresponds to the top of the Basal Solling Sandstone Member.
UK: Bunter Sandstone Formation; GER: Middle Buntsandstein Group; BEL: Main Buntsandstein Formation.
For the major part the equivalent of the Middle Bunter Formation of NAM & 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]). middle Bunter sandstone. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/middle-bunter-sandstone.