| Exter Formation | |
|---|---|
| Stratigraphic range: Rhaetian ~ | |
 Exter Formation at Krauthausen | |
| Type | Formation |
| Unit of | Keuper |
| Sub-units | Rinteln, Oeynhausen & Vahlbruch Subformations |
| Underlies | Black Jurassic |
| Overlies | Arnstadt & Trossingen Formations |
| Thickness | Typically between 100 and 150 m (330 and 490 ft) Locally 250 m (820 ft) in northern Germany Up to 45 m (148 ft) in southern Germany |
| Lithology | |
| Primary | Claystone, siltstone, sandstone |
| Other | Coal |
| Location | |
| Coordinates | 48°36′N 9°06′E / 48.6°N 9.1°E |
| Approximate paleocoordinates | 36°06′N 10°48′E / 36.1°N 10.8°E |
| Region | Niedersachsen, Baden-Württemberg, Westphalia, Bavaria |
| Country |  Germany |
| Extent | Widespread |
  Exter Formation (Germany) | |
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]