Tsagaantsav Formation Explained

Tsagaantsav Formation
Type:	Geological formation
Age:	Hauterivian-Barremian
Period:	Barremian
Prilithology:	Sandstone, siltstone
Namedfor:	Tsagan-Tsab well
Region:	Khovd, Uvs, Dornogovi & Övörkhangai Provinces
Country:	Mongolia
Coordinates:	44.9°N 110.4°W
Paleocoordinates:	46.7°N 112.3°W
Underlies:	Zuunbayan Formation, Shinekhudag Formation
Overlies:	Basement

The Tsagaantsav Formation, Tsagantsab Formation or Tsagan-Tsab Formation (Russian: Tsagaantsav Svita) is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia.^[1] Indeterminate sauropod and psittacosaurid remains have been recovered from the formation.^[2] Remains of the pterosaur Noripterus, which were originally given their own genus, "Phobetor" have also been recovered from the formation.^{[3] [4]}

Graham et al. 2001 reported radiometric dates of 131 and 126 Ma from the formation.^[5]

Fossil content

The following fossils were reported from the fluvial to lacustrine sandstones and siltstones of the formation:^[1]

• Pterosaurs
  • Noripterus complicidens
• Dinosaurs
  • Psittacosaurus sp.
  • Sauropoda indet.
  • Theropoda indet.
• Lizards
  • Dorsetisauridae indet.

Insects

• Khutelchalcis gobiensis
• Eopelecinus fragilis
• E. minutus
• Praeichneumon townesi
• Eobraconus inopinatus
• Westratia femorata
• W. pachygaster
• W. pentadecamera
• Langtonius cynaricaudatus
• Eugenodiamesa makarchenkoi
• Jurochlus adustus
• Ellia khara
• Protanyderus mesozoicus
• Metatrichopteridium cladistorum
• Plectrocentropus sulis
• Eoclipsis mongolica
• Coptoclavisca nigricollinus
• Cretorabus orientalis
• Mesaclopus mongolicus
• Chinocimberis dispersus
• Megametrioxenoides longus
• Uroperla lacerata
• Trianguliperla quassa
• Aphaorus curtipes
• Juleyrodes ?gilli
• Izinabis kerzhneri
• Siberiogenites medius
• Torephemera longipes
• Leptoneta calyptrata
• Albisca tracheata
• Epeoromimus infractus
• Osmylogramma martinsoni^[6]
• Juraphididae indet.

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils
• List of pterosaur-bearing stratigraphic units
• Andaikhudag Formation

References

Bibliography

• Lü . J. . Azuma . Y. . Dong . Z. . Barsbold . R. . Kobayashi . Y. . Lee . Y.-N. . 2009 . New material of dsungaripterid pterosaurs (Pterosauria: Pterodactyloidea) from western Mongolia and its palaeoecological implications . . 146 . 5 . 690–700. 10.1017/S0016756809006414 . 2009GeoM..146..690L .
• Barrett . P.M. . Butler . R.J. . Edwards . N.P. . Milner . A.R. . 2008 . Pterosaur distribution in time and space: an atlas in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer . Hone. D.W.E.. Buffetaut. É. . Zitteliana B . 28 . 61–107.
• Book: . David B. . . Peter . . Halszka . 2004 . The Dinosauria. 2nd . Berkeley. University of California Press . 1–880 . 2019-02-21. 0-520-24209-2.
• Ponomarenko . A.G. . 1992 . Novye setchatokrylye (Insecta: Neuroptera) iz mezozoya Mongolii. Novye Taksony Iskopaemykh Bespozvonochnykh Mongolii . Sovmestnaya Rossiisko-Mongol'skaya Paleontologicheskaya Ekspeditsiya . 41 . 101–111.

Notes and References

1. https://paleobiodb.org/classic/displayStrata?group_hint=&group_formation_member=Tsagaantsav Tsagaantsav Formation
2. Weishampel et al., 2004, pp.517-607
3. Barrett et al., 2008
4. Lü et al., 2009
5. https://paleobiodb.org/classic/basicCollectionSearch?collection_no=121472 Tsagan-Tsab well
6. Ponomarenko, 1992