Schrattenkalk Formation

The name is derived from the Swiss-German "Schratten" (a synonym of Karren) meaning clints or lapies, a phenomenon that frequently affects the limestone.

Synonyms for the extensive formation are Hieroglyphenkalk, Calcaire à Hippurites, Urgonien, Rudistenkalk, Urgo-Aptien, Schrattenschichten, Requienenkalk, Rhodanien, Caprotinenkalk, and Urgonian Limestone.

The upper and lower units consist mostly of reefal limestones with bryozoa, gastropods, corals, sponges, brachiopods, bivalves and rudists.

The upper and lower members represent a photozoan-dominated carbonate platform,[8] and was deposited at the northern edge of the Tethys Ocean.

[11] In an abandoned quarry on the shore of Lake Lucerne, close to the village of Beckenried, fossil trackways were discovered in the formation.