Batylykh Formation

The Batylykh Formation is a geological formation in Yakutia, Russia. It is of an uncertain Early Cretaceous age, probably dating between the Berriasian and the Barremian. It is the oldest unit of the thick Sangar Series within the Vilyuy syneclise. The mudstones, sandstones and shales of the formation were deposited in a fluvial to lacustrine environment.

Fossil content

The formation is best known for the Teete locality, which has revealed remains of numerous vertebrates, including dinosaurs and mammals.

Fossils recovered from the formation include:

• Cryoharamiya tarda
• Khorotherium yakutensis
• Sangarotherium aquilonium
• Xenocretosuchus kolossovi
• Gobiconodon sp.
• cf. Sineleutherus sp.
• Docodonta indet.
• Tritylodontidae indet.'