Informal (Van Adrichem Boogaert & Kouwe 1994).
Residual rock composed of sulphates and claystone, present on top and on the flanks of salt structures. lt separates Zechstein rocks from rocks younger than Lower Triassic and was formed as a result of subrosion and erosion (leaching) of Zechstein evaporites. The composition depends on the insoluables and lesser soluables present, that were left as the salt dissolved.
Definition of lower boundary
Definition of upper boundary
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section D, Permian. Mededelingen Rijks Geologische Dienst, 50, 1-42.
TNO-GDN ([YEAR]). Zechstein caprock. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/zechstein-caprock.