Tsagaantsav Formation
Early Cretaceous geologic formation in Mongolia
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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]
UnderliesZuunbayan Formation, Shinekhudag Formation
OverliesBasement
| Tsagaantsav Formation | |
|---|---|
| Stratigraphic range: Hauterivian-Barremian | |
| Type | Geological formation |
| Underlies | Zuunbayan Formation, Shinekhudag Formation |
| Overlies | Basement |
| Lithology | |
| Primary | Sandstone, siltstone |
| Location | |
| Coordinates | 44.9°N 110.4°E |
| Approximate paleocoordinates | 46.7°N 112.3°E |
| Region | Khovd, Uvs, Dornogovi & Övörkhangai Provinces |
| Country | Mongolia |
| Type section | |
| Named for | Tsagan-Tsab well |
  Tsagaantsav Formation (Mongolia) | |
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
- Dinosaurs
- 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.