Zechstein n. : The upper division of the Permian (Dyas) of Europe. The prevailing rock is a magnesian limestone.

Example:


Taxonomy
Zechstein Sea, the North Sea, free encyclopedia, Permian period, stone, lithostratigraphic, Economic importance, evaporite, rocks, reservoirs, layer, London, Lopingian, Guadalupian, Rotliegend, Late Permian, east coast, northern Poland.

Defination from the web:
Zechstein (German either from mine stone or tough stone) is a unit of sedimentary rock layers of Middle to Late Permian (Guadalupian to ... The Zechstein consists of at least five depostional cycles of evaporite rocks, which are labelled Z1 to Z5 respectively. ...