Haselgebirge` is a sedimentary rock composed of mineral clay, sandstone, anhydrite, rock salt is and other salts. Haselgebirge is common is Alps, where it is used for salt extraction by the sinkworks method. ... Found on http://en.wikipedia.org/wiki/Haselgebirge
1) Sedimentary rock 
Haselgebirge` is a sedimentary rock composed of mineral clay, sandstone, anhydrite, rock salt is and other salts. Haselgebirge is common is Alps, where it is used for salt extraction by the sinkworks method. ...