Trossingen Formation
| Trossingen Formation | |
|---|---|
| Stratigraphic range: Norian-Rhaetian ~ | |
Type exposure at Trossingen | |
| 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 |
| Approximate paleocoordinates | 31°54′N 10°24′E / 31.9°N 10.4°E |
| Region | Central Europe |
| Country | Germany, Switzerland |
| Extent | Southern half of Germany |
| Type section | |
| Named for | Trossingen |
| Named by | Beutler |
| Year defined | 2005 |
The Trossingen Formation, formerly the Knollenmergel (also known as the Arnstadt Formation), is a geological formation in Germany and Switzerland. It dates back to the late Norian-Rhaetian. It belongs to the Keuper Group of the Germanic Triassic. The Trossingen Formation is underlain by the Löwenstein Formation and erosively overlain by the Exter Formation, in part also directly by the Black Jurassic.