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The Late Triassic (Norian Bhaetian) carbonate sediments in the Northern Limestone Alps are spread between two large facies of a shelf. To the southeast the Dachsteinkalk-Formation in the Norian and t~haetian shows a thick series of shallow-water limestones, to which reef complexes are marginally annexed. Between the Dachstein-limestones the Hallst~itter Formation was deposited in single, shallow basins, showing limestones and marls of little thickness. The Hauptdolomit Formation, following to the north and to the west, shows a uniform lagoonal development in the Norian, which is differentiated in the Rhaetian by ridges of limestone sedimentation and by basins of marl sedimentation.

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