Coordinates: 41°18′N 72°06′E / 41.3°N 72.1°E / 41.3; 72.1

Balabansai Formation

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Balabansai Formation
Stratigraphic range: Bathonian-Callovian
~168–164 Ma
↓
TypeGeological formation
UnderliesHodzhiabad Formation[1]
Cretaceous red beds
OverliesIgrysai Svita[1]
ThicknessUp to 250 m (820 ft)
Lithology
PrimarySandstone, siltstone, claystone
OtherGravel, marl
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionOngtustik Qazaqstan oblysy, Jalal-Abad Region
CountryKazakhstan, Kyrgyzstan, Uzbekistan
Balabansai Formation (Kyrgyzstan)

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]

Vertebrate paleofauna

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

Fish

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

Amphibians

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Amphibians of the Balabansai Formation
Genus Species Presence Notes
Ferganobatrachus[6] F. riabinini Temnospondyl
Kokartus K. honorarius Salamander

Turtles

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

Lizards

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

Choristoderes

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

Crocodyliformes

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Crocodyliformes
Genus Species Presence Notes
Sunosuchus Indeterminate

Dinosaurs

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Dinosaurs
Genus Species Presence Material Notes

Praeornis[2]

P. sharovi[2]

Geographically located in Ongtustik Qazaqstan Oblysy, Kazakhstan.[2]
Alpkarakush[7] 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[8] F. verzilini Located within Kyrgyzstan Basal sauropod
Ferganocephale[3] F. adenticulatum Located within Kyrgyzstan Dubious taxon, Neornithischia indet.
Neosauropoda indet.[3] 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.[3] Family, genus and species indeterminate Kyrgyzstan Dozens of teeth
Stegosauria indet.[9] 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

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Mammals
Genus Species Presence Notes
Rhamphorhynchinae indet.[3] Genus and species indeterminate Kyrgyzstan

Mammals

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Mammals
Genus Species Presence Notes
Ferganodon F. cf. naryensis A eutriconodont
Paritatodon Indeterminate A docodont or a shuotheriid
Simpsonodon Indeterminate A docodont, multiple species present
Tashkumyrodon[10] T. desideratus A docodont
Amphilestidae Indeterminate
Amphitheriidae Indeterminate
Docodonta Indeterminate
Paurodontidae Indeterminate
Tegotheriidae Indeterminate
Tinodontidae Indeterminate
Triconodontidae Indeterminate

Invertebrate paleofauna

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Molluscs

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Genus Species Presence Notes
Proparreysia[11] "P. thashkumyrica" A bivalve
Sulcatapex[11] "S. chatkalica" A bivalve
Yeniella[11] "Y. asiatica", "Y. sculpturata" A bivalve

Flora

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Conifers

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Genus Species Presence Notes
Podozamites[11] P. lanceolatus

Ferns

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Genus Species Presence Notes
Cladophlebis[11] C. whitbiensis
Coniopteris[11] C. furssenkoi, C. hymenophylloides

See also

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References

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  1. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ a b c d e 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. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)..
  3. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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  11. ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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