The Tsagaantsav Formation, Tsagantsab Formation or Tsagan-Tsab Formation (Russian: Tsagaantsav Svita) is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia.Tsagaantsav Formation in the Paleobiology Database Indeterminate sauropod and psittacosaurid remains have been recovered from the formation.Weishampel et al., 2004, pp.517-607 Remains of the pterosaur Noripterus, which were originally given their own genus, "Phobetor" have also been recovered from the formation.Barrett et al., 2008Lü et al., 2009
Graham et al. 2001 reported radiometric dates of 131 and 126 Ma from the formation.Tsagan-Tsab well in the Paleobiology Database
Fossil content The following fossils were reported from the fluvial to lacustrine sandstones and siltstones of the formation: 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 martinsoniPonomarenko, 1992 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
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