Erfurt Formation
The Erfurt Formation, also known as the Lower Keuper (German: Untere Keuper, Lettenkeuper, Lettenkohle or Lettenkohlenkeuper), is a stratigraphic formation of the Keuper group and the Germanic Trias supergroup. It was deposited during the Ladinian stage of the Triassic period. It lies above the Upper Muschelkalk and below the Middle Keuper.
| Erfurt Formation | |
|---|---|
| Stratigraphic range: Ladinian ~ | |
Outcrop of the formation at the Schumann quarry near Vellberg | |
| Type | Geological formation |
| Unit of | Lower Keuper |
| Sub-units | Bairdienkalk, Grenzdolomit, Lettenkeuper, Sandige Pflanzenschiefer, Untere Graue Mergel & Werksandstein Members |
| Underlies | Grabfeld Formation |
| Overlies | Upper Muschelkalk |
| Thickness | 20–700 m (66–2,297 ft) |
| Lithology | |
| Primary | Marl |
| Other | Claystone, dolomite, limestone, sandstone |
| Location | |
| Coordinates | 50.949036°N 11.070136°E |
| Approximate paleocoordinates | 15.1°N 16.6°E |
| Region | Baden-Württemberg, Thuringia |
| Country | Germany |
| Extent | Mittelgebirge, North German Plain |
| Type section | |
| Named for | Erfurt |
| Named by | Hoffmann |
| Year defined | 1830 |
Erfurt Formation (Germany) | |
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