| Tsagaantsav Formation | |
|---|---|
|
Stratigraphic range:
Hauterivian-
Barremian | |
| 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 |
| Approximate paleocoordinates | 46°42′N 112°18′E / 46.7°N 112.3°E |
| 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]
- 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 pterosaur-bearing stratigraphic units
- Andaikhudag Formation
References
- ^ a b 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.; Y. Azuma; Z. Dong; R. Barsbold; Y. Kobayashi, and Y.-N. Lee. 2009. New material of dsungaripterid pterosaurs (Pterosauria: Pterodactyloidea) from western Mongolia and its palaeoecological implications. Geological Magazine 146. 690–700. .
- Barrett, P.M.; R.J. Butler; N.P. Edwards, and A.R. Milner. 2008. Pterosaur distribution in time and space: an atlas in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer. Zitteliana B 28. 61–107. .
- Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 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. .