Rhyolite Member ORBUR


Type section Location map See figure (pdf)
  Well A17-01 (pdf)
  Location N 55°01’11.4
E 03°39’29.4
  Depth 2157 to 2296 m
  Length 139 m along hole
Definition Extrusive volcanic unit of an acidic composition, massive, grey to pale pink, consisting of a microcrystalline groundmass with quartz phenocrysts. Petrologically interpreted as a rhyolite. The sediments overlying the Rhyolite Member contain a number of thin volcanic beds (minor lava flows).
References See References Devonian and Lower Carboniferous

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].