Code
ORBUR
Status
Formal (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
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).
Depositional setting
Volcanic.
Definition of lower boundary
Not yet defined
Definition of upper boundary
Not yet defined
Thickness indication
Up to 139 m.
Geographical distribution
Regional correlation
Unknown.
Age
Radiometrically dated at 341 ± 30 Ma (Mobil Producing Netherlands Inc.; published in Sissingh 2004). Dating implies Visean age, i.e. early Carboniferous.
Holostratotype
Well:
Depth (thickness) AH:
2157 to 2296 m (139 m)
Previous name(s)
None.
Reviewed by (date)
Tom van Hoof, Geert-Jan Vis (2018).
References
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.
Cite as
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.