The Aitym Formation is a geological formation in Uzbekistan which possibly dates to the Santonian stage of the Late Cretaceous period.
The formation has not been precisely dated. However, certain fossils suggest the formation was deposited during the Santonian stage of the Late Cretaceous period.
Fossil content A diverse fauna has been unearthed from the Aitym Formation including oysters, ammonites and many marine vertebrates, including an abundant assemblage of chondrichthyans (cartilaginous fish), a rarer assemblage of osteichthyans (bony fish), and rather infrequent finds of plesiosaurs, and sea turtles. Terrestrial vertebrate remains are extremely rare in the formation. A few bones of salamanders, lizards, crocodiles, possibly terrestrial turtle remains, dinosaurs (including birds), and mammals have been found in the formation.
Mammals Mammals of the Aitym Formation Genus Species Location Notes Images UzbekbaatarU. wardiA cimolodontan multituberculateShalbaatarcf. S. sp.A spalacotheriid symmetrodontDeltatheruscf. D. sp.A deltatheroidan; reclassified later as Sulestes, as the two genera have been synonymized Daulestesaff. D. spA asioryctithereKulbeckiaKulbeckia sp. cf. K. kulbeckeA possible zalambdalestidaff. Kulbeckia sp.ParanyctoidesParanyctoides sp. cf. P. aralensisA possible lipotyphlanParanyctoides sp.EoungulatumE. sp. cf. E. kudukensisZhelestid ungulatomorphsParazhelestesP. sp. cf. P. robustusP. sp. aff. P. minorAspanlestescf. A. sp.
Molluscs Molluscs of the Aitym Formation Genus Species Location Notes Images Placenticeras P. kyzylkumenseA placenticeratid ammonite
Amphibians Amphibians of the Aitym Formation Genus Species Location Notes Images EoscapherpetonE. asiaticumA giant salamander
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