The Balabansai Formation (sometimes transcribed Balabansay,^[1] also known as Balabansai Svita) is a geological formation in Kazakhstan, Kyrgyzstan and Uzbekistan whose strata date back to the Bathonian and Callovian stages of the Middle Jurassic. Dinosaur remains are among the fossils that have been recovered from the formation.^[2] The lithology primarily consists of variegated sandstones, siltstones, claystones, and rare gravels and marls.^[3] Many taxa have been found in the formation, including amphibians^[4] and mammals^[5]

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Balabansai Formation
Stratigraphic range: Bathonian-Callovian ~168–164 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Hodzhiabad Formation[1] Cretaceous red beds
Overlies	Igrysai Svita[1]
Thickness	Up to 250 m (820 ft)
Lithology
Primary	Sandstone, siltstone, claystone
Other	Gravel, marl
Location
Coordinates	41.3°N 72.1°E / 41.3; 72.1
Approximate paleocoordinates	40.9°N 76.2°E / 40.9; 76.2
Region	Ongtustik Qazaqstan oblysy, Jalal-Abad Region
Country	Kazakhstan  Kyrgyzstan  Uzbekistan
Balabansai Formation (Kyrgyzstan)

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Indeterminate Avialae remains located in Ongtustik Qazaqstan Oblysy, Kazakhstan.^[2]

• List of dinosaur-bearing rock formations