Earth:Andaikhudag Formation

Short description: Early Cretaceous geologic formation in Mongolia

Andaikhudag Formation Stratigraphic range: Hauterivian-Barremian ~132–125 Ma PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Shale
Other	Sandstone
Location
Coordinates
Paleocoordinates	[ ⚑ ] 47.2°N 100.3°E / 47.2; 100.3
Region	Bayankhongor Province
Country	Mongolia
Andaikhudag Formation (Mongolia)

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. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.

Fossil content

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

Birds

• Ambiortus dementjevi - "Vertebrae and forelimb"
• Holbotia ponomarenkoi

Insects

• Hymenoptera
  • Kotujisca kholbotensis
  • Neoxyelula reducta
  • Palaeoichneumon townesi
• Diptera
  • Syntemna tele
  • Ulaia communis
• Coleoptera
  • Allophalerus bontsaganensis
  • Tetraphalerus notatus
• Plecoptera
  • Accretonemoura radiata

See also

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

References

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 14. 319–338. 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.