Formal (Herngreen, Smit & Wong 1991). Amended (Van Adrichem Boogaert & Kouwe 1993).
Volcaniclast-bearing detrital layers, locally intercalated in reddish-brown, green, and grey clays and siltstones of the Zurich Formation. The volcaniclasts are opaque, green, red, and brown, fine to coarse grained, predominantly angular to subangular with a greyish, tuffaceous matrix.
Unclear whether these deposits were formed contamporaneously with the Zuidwal Volcanic Dome or were formed by erosion of the volcano (Herngreen, Smit and Wong 1991).
Definition of lower boundary
Characterised by a conformable, sudden transition into calcareous to dolomitic, vari-coloured mudstones with rare sand and coal bed intercalations.
Definition of upper boundary
Characterised by a conformable, sudden transition into coaly, varicoloured mudstones with rare sand and abundant coal-bed intercalations.
Origin of name
Named after the Wadden Sea.
Herngreen, G.F.W., Smit, R. & Wong, Th.E. 1991. Stratigraphy and tectonics of the Vlieland basin, The Netherlands. Special Publication of the European Association of Petroleum Geoscientists, Berlin, 175-192.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..
TNO-GDN ([YEAR]). Wadden Volcaniclastic Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/wadden-volcaniclastic-member.