Informal (NAM & RGD 1980).
Claystone. Where the boundary between the Middle Muschelkalk Marl Member and the Upper Muschelkalk Member tends to become obscure, e.g. in the southern onshore and the western offshore, as a result of a decrease in carbonate content of the latter member, the upper two members can be lumped into a larger unit, informally called the Muschelkalk Claystone member.
Definition of lower boundary
Definition of upper boundary
middle Anisian - early Ladinian.
Origin of name
Name derived from the German stratigraphic nomenclature, where it is applied to the middle, predominantly marine, part of the German Triassic.
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
TNO-GDN ([YEAR]). Muschelkalk Claystone member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/muschelkalk-claystone-member.