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Erfurt Formation
Lithostratigraphic unit in Europe / From Wikipedia, the free encyclopedia
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]
Quick Facts Type, Unit of ...
Erfurt Formation | |
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Stratigraphic range: Ladinian ~242–237 Ma | |
![]() 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 | 50.949036°N 11.070136°E / 50.949036; 11.070136 |
Approximate paleocoordinates | 15.1°N 16.6°E / 15.1; 16.6 |
Region | Baden-Württemberg, Thuringia |
Country | ![]() |
Extent | Mittelgebirge, North German Plain |
Type section | |
Named for | Erfurt |
Named by | Hoffmann |
Year defined | 1830 |
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