Tsagaantsav Formation


The Tsagaantsav Formation, Tsagantsab Formation or Tsagan-Tsab Formation is an Early Cretaceous 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:
;InsectsKhutelchalcis gobiensisEopelecinus fragilisE. minutusPraeichneumon townesiEobraconus inopinatusWestratia femorataW. pachygasterW. pentadecameraLangtonius cynaricaudatusEugenodiamesa makarchenkoiJurochlus adustusEllia kharaProtanyderus mesozoicusMetatrichopteridium cladistorumPlectrocentropus sulisEoclipsis mongolicaCoptoclavisca nigricollinusCretorabus orientalisMesaclopus mongolicusChinocimberis dispersusMegametrioxenoides longusUroperla lacerataTrianguliperla quassaAphaorus curtipesJuleyrodes ?gilliIzinabis kerzhneriSiberiogenites mediusTorephemera longipesLeptoneta calyptrataAlbisca tracheataEpeoromimus infractusOsmylogramma martinsoni