| 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)[1] |
| Lithology | |
| Primary | Marl |
| Other | Claystone, dolomite, limestone, sandstone |
| Location | |
| Coordinates | 50°56′57″N 11°04′12″E / 50.949036°N 11.070136°E |
| Approximate paleocoordinates | 15°06′N 16°36′E / 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) | |
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.[2] It lies above the Upper Muschelkalk and below the Middle Keuper.[1]
- ^ a b "Erfurt Formation". BGR. Archived from the original on 10 February 2013. Retrieved 2 March 2013.
- ^ Erfurt Formation at Fossilworks.org