| 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. Indeterminate sauropod and psittacosaurid remains have been recovered from the formation. Remains of the pterosaur Noripterus, which were originally given their own genus, "Phobetor" have also been recovered from the formation.
Graham et al. 2001 reported radiometric dates of 131 and 126 Ma from the formation.
Fossil content
The following fossils were reported from the fluvial to lacustrine sandstones and siltstones of the formation:
- 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
- Juraphididae indet.
See also
- List of dinosaur-bearing rock formations
- List of pterosaur-bearing stratigraphic units
- Andaikhudag Formation
References
- ^ Tsagaantsav Formation in the Paleobiology Database
- Weishampel et al., 2004, pp.517-607
- Barrett et al., 2008
- Lü et al., 2009
- Tsagan-Tsab well in the Paleobiology Database
- 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.