Formal (Van Adrichem Boogaert & Kouwe 1994).
Extrusive volcanic unit of acidic composition, massive, grey to pale pink, consisting of a microcrystalline groundmass with quartz phenocrysts. Petrologically interpreted as a rhyolite. The sediments overlying this member contain a number of thin volcanic beds (minor lava flows).
Definition of lower boundary
Definition of upper boundary
Radiometrically dated at 341 ± 30 Ma (Mobil Producing Netherlands Inc.; published in Sissingh 2004). Dating implies Visean age, i.e. early Carboniferous.
Reviewed by (date)
Tom van Hoof, Geert-Jan Vis (2018).
Sissing, W. 2004. Palaeozoic and Mesozoic igneous activity in the Netherlands: a tectonomagmatic review. Netherlands Journal of Geosciences 83 (2), 111-134.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section B, Devonian and Dinantian. Mededelingen Rijks Geologische Dienst, 50, 1-20.
TNO-GDN ([YEAR]). Rhyolite Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/rhyolite-member.