Iren Dabasu Formation
| Iren Dabasu Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Overlies | Arshanto Formation |
| Area | Erenhot (Erlian) city |
| Thickness | Up to 500 m (1,600 ft) |
| Lithology | |
| Primary | Sandstone, claystone, siltstone |
| Other | Glutenite |
| Location | |
| Coordinates | 43°48′N 112°24′E / 43.8°N 112.4°E |
| Approximate paleocoordinates | 43°06′N 101°00′E / 43.1°N 101.0°E |
| Region | Inner Mongolia |
| Country | China |
| Extent | Erlian Basin |
| Type section | |
| Named for | Iren Dabasu |
| Named by | Osborn |
| Year defined | 1922 |
The Iren Dabasu Formation (also known as Erlian Formation) is a Late Cretaceous geologic formation in the Iren Nor region of Inner Mongolia. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. The formation was first described and defined by Henry Fairfield Osborn in 1922 and it is located in the Iren Nor region of China.