The Khuren Dukh Formation, also known as the Khukhtyk Formation, Khukhteeg Formation, or Hühteeg Svita, (Mongolian: Хөхтээг формаци, 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]