Andaikhudag Formation

The Andaikhudag Formation, in older literature referred to as Unduruh Formation or Ondorukhaa Formation, is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia.[1] Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.[2]

Andaikhudag Formation Stratigraphic range: Hauterivian-Barremian ~132–125 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Shale
Other	Sandstone
Location
Coordinates	46.0°N 99.6°E
Approximate paleocoordinates	47.2°N 100.3°E
Region	Bayankhongor Province
Country	Mongolia
Andaikhudag Formation (Mongolia)

Fossil content

The following fossils have been reported from the lacustrine shales and secondary sandstones of the formation:[1]

Birds

• Ambiortus dementjevi[3] - "Vertebrae and forelimb"[4]
• Holbotia ponomarenkoi[5]

Insects

• Hymenoptera
  • Kotujisca kholbotensis[6]
  • Neoxyelula reducta[7]
  • Palaeoichneumon townesi[8]
• Diptera
  • Syntemna tele[9]
  • Ulaia communis[10]
• Coleoptera
  • Allophalerus bontsaganensis[11]
  • Tetraphalerus notatus[11]
• Plecoptera
  • Accretonemoura radiata[12]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera
• Tsagaantsav Formation

References

1. Andaikhudag Formation in the Paleobiology Database
2. Weishampel et al., 2004, pp.517-607
3. Kurochkin, 2000
4. "Table 11.1," in Weishampel et al., 2004, p.214
5. Zelenkov & Averianov, 2015
6. Rasnitsyn, 1991
7. Rasnitsyn, 1993
8. Kopylov, 2009
9. Blagoderov, 2000
10. Kalugina, 1993
11. Ponomarenko, 1997
12. Sinitshenkova, 1987

Bibliography

• Zelenkov, Nikita V., and Alexander O. Averianov. 2015. A historical specimen of enantiornithine bird from the Early Cretaceous of Mongolia representing a new taxon with a specialized neck morphology. Journal of Systematic Palaeontology Online edition. .. doi:10.1080/14772019.2015.1051146
• Kopylov, D.S. 2009. A new subfamily of Ichneumonids from the Lower Cretaceous of Transbaikalia and Mongolia (Insecta: Hymenoptera: Ichneumonidae). Paleontological Journal 43. 83–93.
• Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2
• Blagoderov, V.A. 2000. New fungus gnats (Diptera: Mycetophilidae) from the Cretaceous and Paleogene of Asia. Paleontological Journal 34. S355–S359.
• Kurochkin, E.N. 2000. Mesozoic birds of Mongolia and the former USSR in M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), 533–559. The Age of Dinosaurs in Russia and Mongolia.
• Ponomarenko, A.G. 1997. New beetles of the family Cupedidae from the Mesozoic of Mongolia - Ommatini, Mesocupedini, Priacmini. Paleontological Journal 31. 389–399.
• Kalugina, N.S. 1993. Khaoboridy i Komary-zvontsy iz Mezozoya vostochnogo Zabaykal'ya (Diptera: Chaoboridae, Chironomidae). in, 117–139. A. G. Ponomarenko (ed.), Mezozoyskie Nasekomye i Ostrakody Azii.
• Rasnitsyn, A.P. 1993. Novye taksony sepulek (Vespida: Sepulcidae) in, 80–99. A. G. Ponomarenko (ed.) Mezozoyskie Nasekomye i Ostrakody Azii.
• Rasnitsyn, A.P. 1991. Early Cretaceous evanimorphous hymenopteran families Stigmaphronidae and Cretevaniidae and the subfamily Kotujellitinae (Gasteruptiidae). Paleontological Journal 25. 172–179.
• Sinitshenkova, N.D. 1987. Istopicheskoe razvitie vesiyanok. Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta 221. 1–142.