Andaikhudag Formation
| Andaikhudag Formation | |
|---|---|
| Stratigraphic range: Hauterivian-Barremian ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Shale |
| Other | Sandstone |
| Location | |
| Coordinates | 46°00′N 99°36′E / 46.0°N 99.6°E |
| Approximate paleocoordinates | 47°12′N 100°18′E / 47.2°N 100.3°E |
| Region | Bayankhongor Province |
| Country | Mongolia |
The Andaikhudag Formation, in older literature referred to as Unduruh Formation or Ondorukhaa Formation, is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.