Topic
formation
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The Trossingen Formation, formerly the Knollenmergel, is a geological formation in Germany and Switzerland. It dates back to the late Norian-Rhaetian. It belongs to the Keuper Group of the Germanic Triassic. The Trossingen Formation is underlain by the Löwenstein Formation and erosively overlain by the Exter Formation, in part also directly by the Black Jurassic.