The Ialovachsk or Yalovach Formation is a geologic formation in Kyrgyzstan, Tajikistan and Uzbekistan dating to the Santonian age of the Cretaceous period.

[1] Fossil dinosaur eggs[1] as well as pterosaur, dinosaur,[2][3] turtle[4] and crocodyliforme[5][6] remains have been recovered from the formation.

[7] The following fossils have been reported from the formation: