| Exter Formation | |
| Type: | Formation |
| Age: | Rhaetian ~ |
| Period: | Rhaetian |
| Prilithology: | Claystone, siltstone, sandstone |
| Otherlithology: | Coal |
| Region: | Niedersachsen, Baden-Württemberg, Westphalia, Bavaria |
| Country: |  Germany |
| Coordinates: | 48.6°N 9.1°W |
| Paleocoordinates: | 36.1°N 10.8°W |
| Unitof: | Keuper |
| Subunits: | Rinteln, Oeynhausen & Vahlbruch Subformations |
| Underlies: | Black Jurassic |
| Overlies: | Arnstadt & Trossingen Formations |
| Thickness: | Typically between 100and Locally 250m (820feet) in northern Germany Up to 45m (148feet) in southern Germany |
| Extent: | Widespread |
The Exter Formation is the only formation of the Upper Keuper or Rhätsandstein, and is a geologic formation in Germany. It preserves fossils dating back to the Rhaetian of the Triassic period (specifically around 205 Ma).[1] [2]
The formation has provided fossils of:[1] [2]