Trossingen Formation

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Trossingen Formation
Stratigraphic range: Norian-Rhaetian ~220–201 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Excavation in 1912
Type	Geological formation
Unit of	Keuper
Sub-units	Feuerletten, Grenzmergel & Knollenmergel Members
Underlies	Exter Formation
Overlies	Löwenstein Formation
Thickness	Franconia: 55–60 m (180–197 ft) Southern Württemberg: 10 m (33 ft)
Lithology
Primary	Marl, claystone
Other	Mudstone, sandstone, conglomerate
Location
Coordinates	48°48′N 9°12′E / 48.8°N 9.2°E / 48.8; 9.2
Approximate paleocoordinates	31°54′N 10°24′E / 31.9°N 10.4°E / 31.9; 10.4
Region	Central Europe
Country	Germany  Switzerland
Extent	Southern half of Germany
Type section
Named for	Trossingen
Named by	Beutler
Year defined	2005
Trossingen Formation (Germany)

The Trossingen Formation, formerly the Knollenmergel, is a geological formation in Germany and Switzerland. It dates back to the late Norian-Rhaetian.^[1]