The Donguz Formation, Donguz Svita, or Donguz Rocks (Russian: Донгузские скалы) is a Middle Triassic geological formation that crops out on the right bank of Donguz River in Orenburg Oblast, Russia, across the settlement of Pervomaisky.

The formation is equivalent to a biostratigraphic unit, the Donguz Gorizont.

It is famous for its rich collection of the fossils of Middle Triassic tetrapods.

[2][1][3] It is a nature monument (особо охраняемых природных территорий (ООПТ)).

[4] The following fossils have been found in the Donguz Formation:[1]