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The Klerf Formation is an Early Devonian (Emsian) formation that includes a Lagerstätte in the Northern Eifel hills, at Willwerath near Prüm, Rhineland-Palatinate, Germany. In it Jaekelopterus rhenaniae, a giant eurypterid was discovered. The Klerf Formation, comprising greenish and reddish shales, siltstones and sandstones, was first described in 1919 by Rudolf Richter (1881-1957) and reaches a maximum thickness of about 1,300 metres (4,300 ft).[1]

Klerf Formation
Stratigraphic range: Emsian
~409–392 Ma
TypeGeological formation
Sub-unitsReifferscheid Mb.
Altenberg Mb.
Unterpreth Mb.
UnderliesHeisdorf Formation
OverliesSchleiden Formation
Thickness1,300 m (4,300 ft)
PrimarySiltstone, shale
Coordinates50°14′48″N 06°27′21″W / 50.24667°N 6.45583°W / 50.24667; -6.45583Coordinates: 50°14′48″N 06°27′21″W / 50.24667°N 6.45583°W / 50.24667; -6.45583
Country Germany
Type section
Named byRichter
LocationWillwerath near Prüm
Year defined1919
Coordinates50°14′48″N 06°27′21″W / 50.24667°N 6.45583°W / 50.24667; -6.45583
Approximate paleocoordinates27°06′S 9°42′E / 27.1°S 09.7°E / -27.1; 09.7
Country Germany
Avalonia with the Proto-Tethys Ocean (3)

Depositional environmentEdit

The siltstone and sandstone formation was deposited in an estuarine to deltaic environment.[2] This was located on the edge of Avalonia bordering the Proto-Tethys Ocean.

Fossil contentEdit

Apart from the largest arthropod, Jaekelopterus (shown on the left), found in the formation, it also preserved the fish, bryozoa, brachiopod and ostracod remains,[1] the arachnids Devonotarbus hombachensis, Xenarachne willwerathensis,[2] and Mutationella indet. and flora.[3]

See alsoEdit