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Erfurt Formation

Lithostratigraphic unit in Europe From Wikipedia, the free encyclopedia

Erfurt Formationmap
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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]

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Lithostratigraphy of the Keuper of the Germanic basin
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Definition

The formation was defined in Erfurt-Melchendorf in 1830 by Franz Xaver Hofmann and named for the nearby town of Erfurt.[1]

The Erfurt Formation is underlain by the Upper Muschelkalk. The lower boundary to the Erfurt Formation is the "Lettenkohlensandstein" in northern Germany and the "Grenz-bone-beds" in southern Germany.

The formation is a sequence of dolomite, lacustrine limestones, claystone, evaporites, and fluviatile sandstones. The color is usually grey but can also be brown or reddish brown. The average thickness is 60 to 80 meter, with a maximum thickness of 700 meter in the Glückstadt-Graben.[1]

The upper boundary is marked by dolomites, or claystones of the Grabfeld Formation.[1]

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Fossil content

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Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
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Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

The Erfurt Formation is known for its vertebrate fossils. Different kinds of fish, amphibians and archosauriforms have been found. Usually they are found as bone beds, but in 1977 the first complete skeletons were found near Kupferzell. They include Mastodonsaurus, Gerrothorax, Plagiosuchus, Callistomordax, Nanogomphodon, Batrachotomus, Kupferzellia and Palaeoxyris friessi.[3]

Reptiles

More information Reptiles reported from the Erfurt Formation, Genus ...

Synapsids

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Amphibians

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Bony fish

More information Bony fish reported from the Erfurt Formation, Genus ...

Cartilaginous fish

More information Cartilaginous fish reported from the Erfurt Formation, Genus ...
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References

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