Balabansai Formation

The Balabansai Formation (or 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.[1] The lithology primarily consists of variegated sandstones, siltstones, claystones, and rare gravels and marls.[2] Many taxa have been found in the formation, including amphibians[3] and mammals[4]

Balabansai Formation
Stratigraphic range: Bathonian-Callovian
~168–164 Ma
↓
TypeGeological formation
UnderliesCretaceous red beds
OverliesIgrysai Svita
ThicknessUp to 250 m (820 ft)
Lithology
PrimarySandstone, siltstone, claystone
OtherGravel, marl
Location
Coordinates41.3°N 72.1°E / 41.3; 72.1
Approximate paleocoordinates40.9°N 76.2°E / 40.9; 76.2
RegionOngtustik Qazaqstan oblysy, Jalal-Abad Region
Country Kazakhstan
 Kyrgyzstan
 Uzbekistan
Balabansai Formation (Kyrgyzstan)

Vertebrate paleofauna

Indeterminate Avialae remains located in Ongtustik Qazaqstan Oblysy, Kazakhstan.[1]

Fish
Fish of the Balabansai Formation
Genus Species Presence Notes
Ferganoceratodus F. jurassicus Lungfish

Amphibians
Amphibians of the Balabansai Formation
Genus Species Presence Notes
Ferganobatrachus[5] 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

Praeornis[1]

P. sharovi[1]
  1. Geographically located in Ongtustik Qazaqstan Oblysy, Kazakhstan.[1]
Ferganasaurus[6] F. verzilini Located within Kyrgyzstan Basal Sauropod
Ferganocephale F. adenticulatum Located within Kyrgyzstan Dubious taxon, Neornithischia indet
Stegosauria Indeterminate Kyrgyzstan four posterior dorsal vertebrae Remains not diagnostic, given nomen nudum Ferganastegos by Roman Ulansky.

Mammals
Mammals
Genus Species Presence Notes
Ferganodon F. naryensis cf. sp
Paritatodon Indeterminate
Simpsonodon Indeterminate Multiple species
Tashkumyrodon[7] T. desideratus
Amphilestidae Indeterminate
Amphitheriidae Indeterminate
Docodonta Indeterminate
Paurodontidae Indeterminate
Tegotheriidae Indeterminate
Tinodontidae Indeterminate
Triconodontidae Indeterminate

See also
  • List of dinosaur-bearing rock formations

References
  1. 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.
  2. AVERIANOV, ALEXANDER O.; MARTIN, THOMAS; BAKIROV, AIZEK A. (January 2005). "Pterosaur and dinosaur remains from the Middle Jurassic Balabansai Svita in the northern Fergana Depression, Kyrgyzstan (Central Asia)". Palaeontology. 48 (1): 135–155. doi:10.1111/j.1475-4983.2004.00437.x. ISSN 0031-0239.
  3. Skutschas, Pavel P. (2013-10-01). "Mesozoic salamanders and albanerpetontids of Middle Asia, Kazakhstan, and Siberia". Palaeobiodiversity and Palaeoenvironments. 93 (4): 441–457. doi:10.1007/s12549-013-0126-8. ISSN 1867-1594.
  4. Martin, Thomas; Averianov, Alexander O. (2010-05-18). "Mammals from the Middle Jurassic Balabansai Formation of the Fergana Depression, Kyrgyzstan". Journal of Vertebrate Paleontology. 30 (3): 855–871. doi:10.1080/02724631003758045. ISSN 0272-4634.
  5. AVERIANOV, ALEXANDER O.; MARTIN, THOMAS; SKUTSCHAS, PAVEL P.; REZVYI, ANTON S.; BAKIROV, AIZEK A. (2008-01-25). "AMPHIBIANS FROM THE MIDDLE JURASSIC BALABANSAI SVITA IN THE FERGANA DEPRESSION, KYRGYZSTAN (CENTRAL ASIA)". Palaeontology. 51 (2): 471–485. doi:10.1111/j.1475-4983.2007.00748.x. ISSN 0031-0239.
  6. Alifanov, Vladimir R.; Averianov, Alexander O. (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. 23 (2): 358–372. doi:10.1671/0272-4634(2003)023[0358:fvgesn]2.0.co;2. ISSN 0272-4634.
  7. Martin, Thomas; Averianov, Alexander O. (2004-03-25). "A new docodont (Mammalia) from the Middle Jurassic of Kyrgyzstan, central Asia". Journal of Vertebrate Paleontology. 24 (1): 195–201. doi:10.1671/15. ISSN 0272-4634.
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