Balabansai Formation

Balabansai Formation
Stratigraphic range: Bathonian–Callovian
↓
Type Geological formation
Underlies Cretaceous red beds
Overlies Igrysai Svita
Thickness Up to 250 m (820 ft)
Lithology
Primary Sandstone, siltstone, claystone
Other Gravel, Marl
Location
Region Asia
Country  Kazakhstan
 Kyrgyzstan
Extent Ongtustik Qazaqstan oblysy, Jalal-Abad Region

The Balabansai Formation (or Balabansai Svita) is a geological formation in Kazakhstan and Kyrgyzstan 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]

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

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

Crocodyliformes

Crocodyliformes of the Balabansai Formation
Genus Species Presence Notes
Sunosuchus Indeterminate

Dinosaurs

Dinosaurs of the Balabansai Formation
Genus Species Presence Material Notes

Praeornis[1]

P. sharovi[1]
  1. Geographically located in Ongtustik Qazaqstan Oblysy, Kazakhstan.[1]
Ferganasaurus[6] P. 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, but declared dubious genus Ferganastegos by amateur paleontologist.

Mammals

Sunosuchus
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

References

  1. 1 2 3 4 5 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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