Tsagaantsav Formation

Tsagaantsav Formation
Stratigraphic range: Hauterivian-Barremian 131–126  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Zuunbayan Formation, Shinekhudag Formation
Overlies	Basement
Lithology
Primary	Sandstone, siltstone
Location
Coordinates	44°54′N110°24′E / 44.9°N 110.4°E / 44.9; 110.4
Approximate paleocoordinates	46°42′N112°18′E / 46.7°N 112.3°E / 46.7; 112.3
Region	Khovd, Uvs, Dornogovi & Övörkhangai Provinces
Country	Mongolia
Type section
Named for	Tsagan-Tsab well
Tsagaantsav Formation (Mongolia)

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

1. Tsagaantsav Formation in the Paleobiology Database
2. Weishampel et al., 2004, pp.517-607
3. Barrett et al., 2008
4. Lü et al., 2009
5. Tsagan-Tsab well in the Paleobiology Database
6. Ponomarenko, 1992

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". Geological Magazine . 146 (5): 690–700. Bibcode:2009GeoM..146..690L. doi:10.1017/S0016756809006414.
• Barrett, P.M.; Butler, R.J.; Edwards, N.P.; Milner, A.R. (2008). Hone, D.W.E.; Buffetaut, É. (eds.). "Pterosaur distribution in time and space: an atlas in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer" (PDF). Zitteliana B. 28: 61–107.
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka, eds. (2004). The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 1–880. ISBN   0-520-24209-2 . Retrieved 2019-02-21.
• 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.