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 | |
|---|---|
| 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 | |
| Coordinates | 41.3°N 72.1°E |
| Approximate paleocoordinates | 40.9°N 76.2°E |
| Region | Ongtustik 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 | |
|
P. sharovi[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
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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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