Donguz Formation

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]

Donguz Formation Stratigraphic range: Anisian ~247–242 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Eryosuchus, an index fossil of the Donguz
Type	Stratigraphic Formation
Underlies	Bukobay Svita[1]
Overlies	Petropavlovskaya Svita (Yarenskian Gorizont)
Lithology
Primary	Sandstone
Other	Claystone, conglomerate
Location
Coordinates	51.5°N 55.2°E / 51.5; 55.2
Approximate paleocoordinates	33.6°N 43.2°E / 33.6; 43.2
Region	Bashkortostan  Orenburg Oblast
Country	Russia
Type section
Named for	Donguz River
Donguz Formation (Russia)

It is a nature monument (особо охраняемых природных территорий (ООПТ)).[4]