 The Arnstadt Formation, or "Steinmergelkeuper", is primarily a lacustrine sedimentary succession of the Germanic Basin.The 100m thick Formation is divided into sediments of a playa lake system, cyclic sediments of freshwater to saline lake system, and sediments of a playa lake system with crevasse splay.Fossil discoveries in Germany were found in dry floodplain environments or fluvial lacustrine indet., where the environment was known to be associated with either rivers or lakes or both.