Informal (Van Adrichem Boogaert & Kouwe 1995).
Claystone. Deposits that belong to the Epen Formation, but are not attributed to either the Ubachsberg Member or the Geverik Member. Where the Epen Formation is split in two by an intercalated Ubachsberg Member the claystone interval above that member may be called upper Epen member.
Cyclic repeated delta progradation into a predominantly lacustrine basin.
Definition of lower boundary
Overlies the sandstones of the Ubachsberg Member.
Serpukhovian - Bashkirian.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1995. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section C, Silesian. Mededelingen Rijks Geologische Dienst, 50, 1-40.
TNO-GDN ([YEAR]). upper Epen member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/upper-epen-member.