| Khuren Dukh Formation | |
| Type: | Geological formation |
| Age: | Early Cretaceous (Aptian–Albian),[1] |
| Period: | Albian |
| Prilithology: | Sandstone, conglomerate, siltstone, mudstone |
| Region: | Dornogovi Province |
| Country: |  Mongolia |
| Coordinates: | 45.9°N 108.4°W |
| Paleocoordinates: | 49.3°N 100.2°W |
| Subunits: | Lower, Middle & Upper Members |
| Underlies: | Terrace deposit, Basalt |
| Overlies: | Khalzan Uul Formation, Basement |
| Thickness: | Over 100m (300feet) |
| Extent: | Choyr Basin |
The Khuren Dukh Formation, also known as the Khukhtyk Formation, Khukhteeg Formation, or Hühteeg Svita, (Mongolian: Хөхтээг формаци, Mongolian: Khökhteeg Formatsi), is a geological formation in Mongolia whose strata date back to the Aptian–Albian ages of the Early Cretaceous.[2] [3] Dinosaur remains are among the fossils that have been recovered from the formation.[4]
The earliest record of Pachycephalosauria.[5]
| Dinosaurs of the Khuren Dukh Formation (Hühteeg Svita) | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Altirhinus | A. kurzanovi | "Complete skull, partial skull, associated postcrania, several individuals."[6] | A hadrosauroid ornithopod | |||
| Choyrodon[7] | C. barsboldi | Partial skull, cervical ribs | A hadrosauroid ornithopod | |||
| Iguanodon | I. orientalis | An indeterminate Iguanodont. A referred skull was reclassified as Altirhinus. | ||||
| Harpymimus[8] | H. okladnikovi | Partial skeleton | An ornithomimosaur | |||
| Choristoderes of the Khuren Dukh Formation (Hühteeg Svita) | |||||||
|---|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images | |
| Khurendukhosaurus | K. orlovi, Indeterminate | Partial skeleton | Long-necked choristodere | ||||
| Tchoiria | T. namsarai | Crocodile-like neochoristoderan. | |||||