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Balabansai Formation

Geological formation in Central Asia

Field	Value
name	Balabansai Formation
type	Geological formation
age	Bathonian-Callovian
~
period	Bathonian
prilithology	Sandstone, siltstone, claystone
otherlithology	Gravel, marl
region	Ongtustik Qazaqstan oblysy, Jalal-Abad Region
country	Kazakhstan, Kyrgyzstan, Uzbekistan
coordinates
paleocoordinates
underlies	Hodzhiabad Formation
Cretaceous red beds
overlies	Igrysai Svita
thickness	Up to 250 m
map	{{Location map+	Kyrgyzstan
relief	1
width	250
float	center
lat_deg	41.3
lon_deg	72.1
mark	Blue pog.svg
marksize	10

~ Cretaceous red beds

The Balabansai Formation (sometimes transcribed Balabansay, 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. The lithology primarily consists of variegated sandstones, siltstones, claystones, and rare gravels and marls. Many taxa have been found in the formation, including amphibians and mammals.

Vertebrate paleofauna

Indeterminate Avialae remains located in Ongtustik Qazaqstan Oblysy, Kazakhstan.

Fish

Fish of the Balabansai Formation	Genus	Presence
Ferganamia	F. verzilini	A bowfin
Ferganoceratodus	F. jurassicus	A lungfish
Palaeobates	P. verzilini	An elasmobranch
Polyacrodus	P. balabansaiensis, P. prodigialis	A hybodont

Amphibians

Amphibians of the Balabansai Formation	Genus	Species	Presence	Notes
Ferganobatrachus	F. riabinini		Temnospondyl
Kokartus	K. honorarius		Salamander

Turtles

Turtles of the Balabansai Formation	Genus	Species	Presence	Notes
Toxocheloides	T. narynensis
Xinjiangchelys	X. tianshanensis, X. latimarginalis		Xinjiangchelydae

Lizards

Lizards of the Balabansai Formation	Genus	Species	Presence	Notes
Changetisaurus	C. estesi		Relative of Dorsetisaurus
Lacertilia	Indeterminate

Choristoderes

Choristoderes of the Balabansai Formation	Genus	Species	Presence	Notes
Choristodera	Indeterminate		Similar to Cteniogenys

Crocodyliformes

Crocodyliformes	Genus	Species	Presence	Notes
Sunosuchus	Indeterminate

Dinosaurs

Dinosaurs	Genus	Species	Presence	Material	Notes
		Geographically located in Ongtustik Qazaqstan Oblysy, Kazakhstan.
last1=Rauhut	first1=Oliver W M	last2=Bakirov	first2=Aizek A	last3=Wings	first3=Oliver	last4=Fernandes	first4=Alexandra E	last5=Hübner	first5=Tom R	date=2024-08-01	title=A new theropod dinosaur from the Callovian Balabansai Formation of Kyrgyzstan	journal=Zoological Journal of the Linnean Society	language=en	volume=201	issue=4	doi=10.1093/zoolinnean/zlae090	issn=0024-4082	doi-access=free }}	A. kyrgyzicus	Jalal-Abad Oblast, Kyrgyzstan	A partial skeleton including skull bones, partial pectoral and pelvic girdles, dorsal and sacral vertebrae, and most of the hindlimbs	A metriacanthosaurid theropod
Ferganasaurus	F. verzilini	Located within Kyrgyzstan		Basal sauropod
Ferganocephale	F. adenticulatum	Located within Kyrgyzstan		Dubious taxon, Neornithischia indet.
Neosauropoda indet.	Family, genus and species indeterminate	Kyrgyzstan	A heavily worn tooth, the apex of a tooth crown, a left metatarsal I, and a right manual phalanx
Tetanurae indet.	Family, genus and species indeterminate	Kyrgyzstan	Dozens of teeth
last1 = Averianov	first1 = A. O.	last2 = Bakirov	first2 = A. A.	last3 = Martin	first3 = T.	year = 2007	title = First definitive stegosaur from the Middle Jurassic of Kyrgyzstan	journal = Paläontologische Zeitschrift	volume = 81	issue = 4	issn = 0031-0220	pages = 440–446	doi = 10.1007/BF02990255	bibcode = 2007PalZ...81..440A	s2cid = 129163170	url = https://www.researchgate.net/publication/225997295 }}	Family, genus and species indeterminate	Kyrgyzstan	Four posterior dorsal vertebrae	May be as old as Adratiklit. Remains not diagnostic, given nomen nudum "Ferganastegos" by Roman Ulansky.

Pterosaurs

Mammals	Genus	Species	Presence	Notes
Rhamphorhynchinae indet.	Genus and species indeterminate	Kyrgyzstan

Mammals

Mammals	Genus	Presence
Ferganodon	F. cf. naryensis	A eutriconodont
Paritatodon	Indeterminate	A docodont or a shuotheriid
Simpsonodon	Indeterminate	A docodont, multiple species present
Tashkumyrodon	T. desideratus	A docodont
Amphilestidae	Indeterminate
Amphitheriidae	Indeterminate
Docodonta	Indeterminate
Paurodontidae	Indeterminate
Tegotheriidae	Indeterminate
Tinodontidae	Indeterminate
Triconodontidae	Indeterminate

Invertebrate paleofauna

Molluscs

Genus	Species	Presence	Notes
last = Кузичкина	first = Ю. М.	chapter = Балабансайская Свита	editor = Министерство геологии СССР	script-title = ru:Стратиграфический словарь СССР: Триас, Юра, Мелсборник	trans-title = Stratigraphic Dictionary of the USSR: Triassic, Jurassic, Cretaceous	publisher = Недра	location = Leningrad	year = 1979	page = 49	url = https://www.geokniga.org/bookfiles/geokniga-1979stratigraficheskijslovartriasjuramel.pdf }}	"P. thashkumyrica"	A bivalve
Sulcatapex	"S. chatkalica"		A bivalve
Yeniella	"Y. asiatica", "Y. sculpturata"		A bivalve

Flora

Conifers

Genus	Species	Presence	Notes
Podozamites	P. lanceolatus

Ferns

Genus	Species	Presence	Notes
Cladophlebis	C. whitbiensis
Coniopteris	C. furssenkoi, C. hymenophylloides

References

(2018). "Source-to-sink dynamics in the Kyrgyz Tien Shan from the Jurassic to the Paleogene: Insights from sedimentological and detrital zircon U-Pb analyses". Gondwana Research.
Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 550–552. {{ISBN. 0-520-24209-2.
(January 2005). "Pterosaur and dinosaur remains from the Middle Jurassic Balabansai Svita in the northern Fergana Depression, Kyrgyzstan (Central Asia)". Palaeontology.
Skutschas, Pavel P.. (2013-10-01). "Mesozoic salamanders and albanerpetontids of Middle Asia, Kazakhstan, and Siberia". Palaeobiodiversity and Palaeoenvironments.
(2010-05-18). "Mammals from the Middle Jurassic Balabansai Formation of the Fergana Depression, Kyrgyzstan". Journal of Vertebrate Paleontology.
(2008-01-25). "Amphibians from the Middle Jurassic Balabansai Svita in the Fergana Depression, Kyrgyzstan (Central Asia)". Palaeontology.
(2024-08-01). "A new theropod dinosaur from the Callovian Balabansai Formation of Kyrgyzstan". [[Zoological Journal of the Linnean Society]].
(2003-06-17). "Ferganasaurus verzilini, gen. et sp. nov., a new neosauropod (Dinosauria, Saurischia, Sauropoda) from the Middle Jurassic of Fergana Valley, Kirghizia". Journal of Vertebrate Paleontology.
(2007). "First definitive stegosaur from the Middle Jurassic of Kyrgyzstan". Paläontologische Zeitschrift.
(2004-03-25). "A new docodont (Mammalia) from the Middle Jurassic of Kyrgyzstan, central Asia". Journal of Vertebrate Paleontology.
{{ cite book. Кузичкина. Ю. М.. Министерство геологии СССР]]. [[Nedra. Недра]]. (1979). link

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