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′N 110°24′E / 44.9°N 110.4°E / 44.9; 110.4
Approximate paleocoordinates	46°42′N 112°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]

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

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

• 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.