Ialovachsk Formation

The Ialovachsk or Yalovach Formation is a geologic formation in Kyrgyzstan, Tajikistan and Uzbekistan dating to the Santonian age of the Cretaceous period.^[1]

Ialovachsk Formation
Stratigraphic range: Santonian 85 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Sandstone
Other	Conglomerate
Location
Coordinates	40.2°N 71.7°E / 40.2; 71.7
Approximate paleocoordinates	34.9°N 65.8°E / 34.9; 65.8
Region	Jalal-Abad, Osh Sughd Fergana
Country	Kyrgyzstan  Tajikistan  Uzbekistan
Extent	Fergana Valley & Range
Ialovachsk Formation (Kyrgyzstan)

Fossil content

Fossil dinosaur eggs^[1] as well as pterosaur, dinosaur,^[2][3] turtle^[4] and crocodyliforme^[5][6] remains have been recovered from the formation.^[7]

The following fossils have been reported from the formation:

Amphibians

• Eopelobates sp.
• Eoscapherpeton superum

Mammals

• ?Kulbeckia kulbecke

Snakes

• Squamata indet.

Turtles

• Adocus foveatus
• Anatolemys maximus
• Lindholmemys gravis
• Shachemys baibolatica
• Trionyx kansaiensis
• T. riabinini

Dinosaurs

• cf. Alectrosaurus sp.
• Ankylosauridae indet.
• ?Ceratopsidae indet.
• Dromaeosauridae indet.
• Hadrosauridae indet.
• cf. Hypsilophodontidae indet.
• Kansaignathus sogdianus
• ?Neoceratopsia indet.
• Neosauropoda indet.
• Ornithomimidae indet.
• ?Oviraptoridae indet.
• Therizinosauridae indet.
• ?Theropoda indet.
• Troodontidae indet.
• Tyrannosauridae indet.

Other archosaurs

• Azhdarchidae indet.
• ?Azhdarcho sp.
• Aves indet.
• Kansajsuchus extensus
• ?Pterosauria indet.
• Tadzhikosuchus macrodentis

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with dinosaur trace fossils
    • Dinosaur eggs

References

1. Weishampel et al., 2004, pp.517-607
2. Alifanov, V. R.; Averianov, A. O. (January 2006). "On the finding of ornithomimid dinosaurs (Saurischia, Ornithomimosauria) in the Upper Cretaceous beds of Tajikistan". Paleontological Journal. 40 (1): 103–108. Bibcode:2006PalJ...40..103A. doi:10.1134/s0031030106010126. ISSN 0031-0301. S2CID 140673522.
3. Averianov, A. O.; Alifanov, V. R. (September 2012). "New data on duck-billed dinosaurs (Ornithischia, Hadrosauridae) from the upper cretaceous of Tajikistan". Paleontological Journal. 46 (5): 512–519. Bibcode:2012PalJ...46..512A. doi:10.1134/s0031030112050036. ISSN 0031-0301. S2CID 140665908.
4. Vitek, Natasha S.; Danilov, Igor G. (2010-03-24). "New material and a reassessment of soft-shelled turtles (Trionychidae) from the Late Cretaceous of Middle Asia and Kazakhstan" (PDF). Journal of Vertebrate Paleontology. 30 (2): 383–393. Bibcode:2010JVPal..30..383V. doi:10.1080/02724631003617548. ISSN 0272-4634. S2CID 83498792.
5. Kuzmin, Ivan T.; Skutschas, Pavel P.; Boitsova, Elizaveta A.; Sues, Hans-Dieter (2018). "Revision of the large crocodyliform Kansajsuchus (Neosuchia) from the Late Cretaceous of Central Asia". Zoological Journal of the Linnean Society. 185 (2): 335–387. doi:10.1093/zoolinnean/zly027.
6. Storrs, Glenn W.; Efimov, Mikhail B. (2000). "Mesozoic crocodyliforms of north-central Eurasia". In Benton, Michael J.; Shishkin, Mikhail A.; Unwin, David M.; Kurochkin, Evgenii N. (eds.). The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. pp. 402–419. ISBN 978-0-521-55476-3.
7. Yalovach Formation at Fossilworks.org

Bibliography

• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21

Further reading

• I. G. Danilov, V. B. Sukhanov, and E. V. Syromyatnikova. 2011. New Asiatic materials on turtles of the family Adocidae with a review of the adocid record in Asia. Proceedings of the Zoological Institute, Russian Academy of Sciences 315(2):101-132
• N. N. Bakhurina and D. M. Unwin. 1995. a survey of pterosaurs from the Jurassic and Cretaceous of the former Soviet Union and Mongolia. Historical Biology 10:197-245
• L. A. Nessov. 1995. Dinozavri severnoi Yevrazii: Novye dannye o sostave kompleksov, ekologii i paleobiogeografii [Dinosaurs of northern Eurasia: new data about assemblages, ecology, and paleobiogeography]. Institute for Scientific Research on the Earth's Crust, St. Petersburg State University, St. Petersburg 1-156