Schrattenkalk Formation

The Schrattenkalk Formation is a Barremian to Aptian geologic formation in the Alps. The limestone is highly karstified. Fossil ornithopod tracks have been reported from the formation. Iguanodont tracks have been registered in the Swiss portion of the formation. The famous north face of the Eiger is partly composed of Schrattenkalk, as well as the Sturmannshöhle in southernmost Bavaria, Germany, and the Hölloch and Silberen system karst caves in Switzerland.
The formation is named after the Schrattenfluh in Luzern, Switzerland. The name is derived from the Swiss-German "Schratten" meaning clints or lapies, a phenomena that frequently affects the limestone. Kalk is limestone in German. Synonyms for the extensive formation are Hieroglyphenkalk, Calcaire à Hippurites, Urgonien, Rudistenkalk, Urgo-Aptien, Schrattenschichten, Requienenkalk, Rhodanien, Caprotinenkalk, and Urgonian Limestone. The formation consists of three units, the Lower Schrattenkalk, Rawil Member and Upper Schrattenkalk.

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