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 | |
|---|---|
 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 |
| Approximate paleocoordinates | 33.6°N 43.2°E |
| Region |   |
| Country |  |
| Type section | |
| Named for | Donguz River |
  Donguz Formation (Russia) | |
It is a nature monument (особо охраняемых природных территорий (ООПТ)).[4]
Fossil content
The following fossils have been found in the Donguz Formation:[1]
- Temnospondyls
- Eryosuchus antiquus, Ochev
- E. garjainovi, Ochev
- E. tverdochlebovi, Ochev
- Bukobaja? sp.
- Plagiorophus danilovi
- Plagioscutum ochevi, Shishkin
- Plagiosternum paraboliceps (Konzhukova)
- Thecodonts
- Procolophonid
- Kapes serotinus, Novikov
- Proterosuchids
- Sarmatosuchus ochevi, Sennikov
- Erythrosuchids
- Uralosaurus magnus, (Ochev)
- Rauisuchidae
- Dongusia colorata, Huene
- Dongusuchus efremovi, Sennikov
- Vjushkovisaurus berdjanensis, Ochev
- Euparkeriidae
- Dorosuchus neoetus, Sennikov
- Dicynodonts
- Kannemeyeria spp.
- Shansiodon (Rhinodicynodon) gracile (Kalandadze)
- Therocephalians
- Dongusaurus schepetovi, Vyushkov
- Nothogomphodon danilovi, Tatarinov
- Diademodontids
- Scalenodon boreus, Tatarinov
- Traversodontids
- Antecosuchus ochevi, Tatarinov
- Therapsids
- Calleonasus furvus
- Cristonasus koltaeviensi
- Elatosaurus facetus
- Nasoplanites danilovi
- Parvobestiola bashkiriensis
- Rabidosaurus cristatus
- Rhadiodromus klimovi
- Fish
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References
- Lucas, Spencer G (1 November 1998). "Global Triassic tetrapod biostratigraphy and biochronology". Palaeogeography, Palaeoclimatology, Palaeoecology. 143 (4): 347–384. CiteSeerX 10.1.1.572.872. doi:10.1016/S0031-0182(98)00117-5.
- Sennikov, A.G. (29 February 1996). "Evolution of the Permian and Triassic tetrapod communities of Eastern Europe". Palaeogeography, Palaeoclimatology, Palaeoecology. 120 (3–4): 331–351. doi:10.1016/0031-0182(95)00041-0.
- область&objregion=Оренбургский район
- Uraloved.ru
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