The Keuper group of the Germanic Basin consists of Middle to Late Triassic sediments, most of them developed in continental facies. The stratigraphic succession is dominated by varicoloured red, green, and grey lacustrine claystones, mudstones and marls with intercalations of evaporite and carbonate beds. Fluvial sandstones interfinger with these basinal facies near the basin margins. They have been shed from scandinavian provenance areas, from the Vindelician-Bohemian Massif and to a minor extent from the Ardennes. At two distinct stratigraphic levels sandstones from Scandinavia spread over all of the Basin. In the Lower and Middle Keuper, marine sediments are only present in the southern part of the Basin. They are restricted to few thin carbonate beds and some estuarine channel deposits. In the Upper Keuper, marine sandstones and mudstones do only occur in the western part of the basin and are restricted to the stratigraphic level of the "contorta-beds". The thickness of the Keuper Group is about 200 to 600 meters over most of the outcrop areas of southern and middle Germany. In most of northern Germany, Keuper deposits are covered but known from many boreholes to be about 500 to 700 meters thick. Some Graben structures beneath northern Germany, however, received more than 1000 meters of Keuper sediments. The maximum thickness of more than 5000 meters has been documented in the Glückstadt Graben beneath the German Bight. Keuper stratigraphy has been explored for nearly two hundred years. Owing to the federal political subdivision of Germany, the regional geological surveys of Germany have developed different stratigraphical systems which are rather confusing for anyone but specialists. The Keuper working group of the German Stratigraphic Commission therefore elaborated a common national lithostratigraphic scheme. This scheme is presented in this volume. The scope of this new lithostratigraphic nomenclature is to support and simplificate correlation over all of Germany and to the Keuper stratigraphy of adjacent countries. The complex stratigraphic architecture of the Keuper Group needs to be described by a set of complementary subdivisions based on different stratigraphic methods. Only in combination with each other do these different aspects merge to an appropriate representation of Keuper stratigraphy. Biostratigraphically, all stages and substages from the Late Ladinian to the Rhaetian are documented within the Keuper Group. The only recognizable gap is indicated for the Lacian substage (early Norian). Keuper biostratigraphy is mainly based on palynomorphs, tetrapods, bivalves, cephalopods, and ostracods. Other groups may prove to be useful by further studies (i.e., plant fossils, fishes, conchostacans, gastropods). Lithostratigraphy allows subdivision of the German Keuper Group into a number of mappable formations. For the basinal facies zone, which is present in most of Germany, six formations are defined herein (from bottom to top): the Erfurt, Grabfeld, Stuttgart, Weser, Amstadt, and Exter formations. At the southeastern fringe of the basin, the vindelician marginal facies zone is subdivided into eight formations: the Grafenwöhr (including a Muschelkalk equivalent in its lower part), Benk, Steigerwald, Hassberge, Mainhardt, Löwenstein, and Trossingen Formations, as well as a marginal equivalent of the Exter Formation not named yet. These national lithostratigraphic units are defined parallel to the traditional units of the politically confined regions as a supplementary tool for their correlation. Unconformities a re present at formation boundaries as well as within nearly all formations. At least seven unconformities can be traced across most of the basin and may be indicators of significant hiatuses. Nine and possibly more unconformities can be recognized on a local to regional scale. Key beds and marker surfaces belong to the fundamentals of Keuper stratigraphy for more than a hundred years. In addition to the basin-wide unconformities, carbonate and anhydrite beds as well as halite strata are used to define six almost isochronous "Folgen" (singular: "Folge"). These Folgen provide a time-referenced allostratigraphic framework supplementing and elucidating the facies boundaries of the lithologically defined formations. Cyclostratigraphy of the Keuper Group is based on a large number of sedimentological studies and allows the distinction of a set of hierarchically structured cycles of different dimensions. Five major cycles, of a duration of several millions of years, are each subdivided by several paracycles with a mean duration of about 100 to 400 ka. Many of these Paracycles are correlatable over distances of several hundreds of kilometers. The Paracycles in turn consist of numerous even smaller genetic cycles of rather local extent and a time equivalent of probably about 10 to 20 ka. First steps of sequence stratigraphy have been made. The present concepts, however, significantly differ from each other and are based only on parts of the basin. The present volume is organized in two main parts: general aspects of the german Keuper Group are presented in in the first section (chapters 2 to 4), whereas the second section (chapter 5 to 6) of this volume is dedicated to detailed descriptions of regional stratigraphy, the correlation of these regional subdivisions to the national scheme, and the correlation of the german Keuper to our neighbouring countries.