Bunter

…three distinct lithostratigraphic units, the Bunter Sandstone, the Muschelkalk Limestone, and the Keuper Marls and Clays, as constituting the Trias or Triassic System.

…strata into three units: the Bunter [or Buntsandstein], Muschelkalk, and Keuper.) Alberti’s rock sequence, which became known as the “Germanic facies,” had many drawbacks as a standard for assigning relative ages to Triassic rocks from other regions of the world, and so for much of the 19th and 20th centuries…